I'll state an old classic that is seen as a genre defining game because it is: Myst. Yes, it redefined the genre... in ways I fucking hated and that the adventure game genre took decades to fully recover from. It was a pompous mess in its presentation and was the worst kind of "doing action does vague thing or nothing at all, where is your hint book" puzzle gameplay wrapped in graphical hype which ages pretty poorly as far as appeal qualities go.
So many adventure games tried to be Myst afterward that the sheer budgetary costs and redundancy of the also-rans crashed the adventure game genre for years.
The new total war games. I find myself returning to medieval 2 every once in a while. The charm is just gone from the newer ones. The spectacle of the Warhammer games does a little bit, but it still feels so hollow.
My issue with going back to old TW, is that while I will agree that there are certain things that feel better about how it plays, and settlements feel like actual places instead of just production hubs; almost every faction feels basically identical in how they play with only the most marginal possible variations in roster. This is less true in Rome 1 of course, but it's especially so in Med2, and Shogun 2, even though I do still like both those games.
TWWH, I believe, is for all it's flaws a genuine advancement in design, because it gave CA license to experiment with hard asymmetries between faction rosters & campaign mechanics.
I guess it's completely reversed for me. Modern day settlements feel like stale Lego bricks, I don't enjoy the limited number of building spots, or how each settlement is more or less locked in to specific buildings by default. I guess I really just miss how governors gained traits by being in a town, governors having to be in towns for good profit and growth (miss the non-abstracted growth too) and I miss their traits actually mattering
Modern day settlements feel like stale Lego bricks, I don't enjoy the limited number of building spots, or how each settlement is more or less locked in to specific buildings by default.
That's the part of it that I'm agreeing with you on, though.