I have played a couple of games with the official solo-rules, mostly to learn the game. The thrill "will I win" was of course nice. So to do that to learn the game is probably not wrong. Then, if you like a solo-game where the AI do the same things you do, then use the rules above. I have noticed that it doesn't take that much longer to use the variant rules than the official rules once you learn them.
“I’d say thistles, but nobody listens to me, anyway.” - Eeyore