Well, you could also make the opposite claim: a very detailed timeline would make the Bladerunner canon too limited. It will be easier to play the game in the ”wrong” way. Does more canonized events make the setting more interesting? Maybe, if it’s done well. But I’d rather see other aspects developed. Such as various factions (LAPD, organized crime, corporations etc) or L.A. and it’s many neighbourhoods. Much of that can be developed with toolkits. Even timelines (for different aspects of the setting) could be done with toolkits. That would make the setting more optional. You make your own version of the setting instead of playing according to a very detailed canon.
What is "canon" at your table is up to you alone. For instance, the way it's written at present, the canonical Blaster is a sniper rifle on top of a revolver. Like hell, at
my table —
not going to happen.
"Canon" as defined in any published game material is, to me, little more than a framework for GMs to build on, to get them thinking and getting their creative juices flowing. When you agree with it, you can work within the framework; when it doesn't suit you, it still provides you with something to
respond to in creating your own canon.
That said, sure — toolkits (depending on exactly what one means with the word) can be another great way to provide GMs with a framework to support their imaginations.
The more the game makes sense out-of-the-box; the better it can support my vision, the better — the less I need to home brew, the happier I'll be all around.