Yeah, I've been getting into Frostpunk. Great game.I can agree with that, at least a little bit. I think that what happened over time was that developers saw more money in multiplayer and competitive games and started building that way.
If it helps, I still play the original doom, in part because there are a million mods for it, and just finished Wolfenstein 3d a couple months ago. Also, RTS games are sort of coming back. They've remastered age of empires, command and conquer, red alert and Warcraft ii. Nothing wrong with enjoying older titles.