Vader,
you assume that tech development is proceeding at a constant, linear, speed. I assume it is not. Let's go tanks...
Chieftain and Challenger I are not that far apart. As Bruce Newsome points out the Challenger I was a political decision (to keep Vickers running) rather than a military one. The big development was the Charley 2. A Chieftain Mk 12/13 or an hypothetical Mk13 or Mk14 using Chobam armor and, possibly, a new engine, would have been a better development. There is no real improvement except engine reliability and chobam between a Mk12 and a Challenger 1. Challenger 2 is an entirely new tank. The main issue with the Challenger is that, barring a reliable breakthrough in tank tech, the Challanger is quite state of the art. Why broke what is working? They made incremental improvement, but right now, there is very little alternative. Okay we are talking UK so it is a quite weird environment. But on the other hand, the big game changer hailed at the time of the original t2k like the LP gun or sufficiently small EM gun, utterly failed. The development cost were too high compared with returns or technical issues. Then you had 140mm guns, promised to be the next shiny thing... okay... heavier, required heavier rounds, and penetrations increase was marginal, and could be obtained with better rounds for 120mm.
It is like the Mk18 torpedo and its magnetic exploder. The latter could not work due to physics (the magnetic field of s ship changes based on the distance from the equator) not money. Of course the MK18 had plenty of other issues, and they were fixed with money and testing, but underlining issues based on incomplete sciences could not be fixed.
Leo 1 and Leo 2 are different tanks based on different approaches and expectations. You can even argue that the Leo 1 was a dead end, and the Leo 2 was simply acknoweldging the Britihs were right with the Chieftain. Then you just incrementally improve it. But you can also argue that the whole M46-47-48-60 series were indeed just incremental improvement from 1947 to the 60s. US tank tech did not move forward until the MBT70 (and it was a failure) and the M1. The M1 appears to have reached the envelope's edge. The new project to replace the Abrams (FCS if memory serves me...) was a troubled one not because funding but because conflicting requirements, constant in-Army wraggling over missions, and frankly fantasy expectations. Right now the big issue is not a new FCS, but developing an M1 upgrade with a diesel engine, hopefully with the same power performance of the current turbine, but less fuel thirst. Even the Armata ended up being less than promised because the shiny concept originally envisioned was much less shiny in reality.
On the other hand looks at money suckers like the Osprey, JSF or LCS. The Osprey is a case study. It could work, it is now more or less working, but it was a vehicle (ac or helo... you chose) with plenty of issues that required time and trial and error to solve. It was a program started in the later 80s. It increased in cost to level of Star Wars Empire silliness... but it was felt the technology involved provided decent tactical returns, plus several USMC commandants chained themselves hand and feet to the program. Of course you can argue that experience in A'stan show that the advantages are not that marked, and they are balanced (or out weighted) by a massive maintenance requirement.
Another example is jet engine technology. The USN put that almost as number 1 priority after 1945. Money was overflowing. Yet until the late 50 engines were crap. The Tiger and the Demon were basically doomed by their engines. For all the money spent the engines were never meeting their expected power output, reliability, and weight. And you have fighters lasting only a couple of year because they were... crap, often by engine problems. Then you have the GE J79, it worked more or less as promised. You got the F4. The F-4 was around for... yup the Rhino is still around. The JASDF is retiring its last this year. You had a newer generations of engines that improved on success and planes designed around them, but then you stopped. The development of jet engine required 20 years to reach a decent level. Then basically stagnated and not because funding, but because it has reached its maturity. After the 70s there is no real improvement. We got super-cruise back in the 60 (the TSR-2 was capable of it). Today what you see are incremental improvements. The potential new thing were the hybrid engines of the SR-71, but they ended up being relatively unsuited to combat aircraft.
I stick to my points.
Said that, I like t2k for the mix of equipment. If we go for the everything top of the line as it is now (2020 not even 2000) it kills variance, it made it not really cold war.
I'd postulate that during the 90's of the Twilight scenario, not only does the rate of development continue unabated; it will accelerate.
Necessarily simplifying of course, but I'd surmise that by break of hostilities in 1997, we could safely introduce many technologies and hardware that didn't enter service IRL until 2000-2002 — even later, in some cases — without breaking suspension of disbelief too much. And create a slightly more interesting milieu in the process.
I disagree. Not only that is realistic, but that it is also 'interesting' (and I would argue that this is a crappy word choice on my part because... I found your idea interesting... but in another milieu! I also want to say it clearly, I enjoy the discussion and meant no disrespect!) . There is also the issue that for all our expertise we are basically making stuff up. We have really no idea of what T2k 1995 would look. Counterfactual usually become exercise in assumptions after two or three variations...
But for me, the big charm of t2k, and I assume for 'some' others, is the 'retro' setting (well retro, I still recall Leo1A2 as standard tanks...) . It is the old cold war gone hot, and then a bit off rails... I lie the idea of US Army regulars in K-pot, but NG units still with steel helmets (and it was mixed in 1989 Panama, with the 6th Marines still in old helmets). I like having some units in J and other in H series. Just my opinion.... and one of the positive elements of an RPG approach opposed to a straight on wargame, is that, as long all the tools are provided, you can then slightly adjust the setting to your taste.