You make the game YOU feel is going to be fun and hope that others come along for the ride. TFP has proven to be successful at this.
I agree to a point. I think they did make a great successful game, and for the most part players loved it or it wouldn't have the fan base is has or this massive forum for another, and then they made a lot of poor decisions both in roll out and fundamental changes that undermined their product.
I do also think the devs have somewhat lost touch with what the game was and have tried to make it too many things to too many people or perhaps into something it is not. For example: It is not a triple A title, never was, but I don't think anyone loved it any less for not being one. In fact I know many players love it because it's not. It was never solely an FPS, but it feels like it has tried to shift more in that direction.
A17 really changed the game in a way many long time fans, such as myself, didn't expect nor ask for. We wanted fixes to spinning zombies and instant respawns (which still happen) new POIs and new zombies, not a complete overhaul of xp and removing the perks and point of mining. It no longer has the longevity it once had.
I also agree that mods certainly do help with that longevity, I doubt I'd have 2000 odd hrs racked up without them, but when some fundamental elements are made redundant such as mining, it really does limit the time you spend in game. There are only so many mods you can combine until it's literally unplayable, as in, it doesn't even load.
Going back to the original OP, I think he has a point and is not alone in feeling curtailed in a players choices that were once there and then removed. The devs might not be "directly trying to kill player options." but in implementing 'new behaviors' in the zombies AI, they have done just that.
My 10 cents is: I loved the game: it had exploration, looting, trading, mining, building, you were rewarded for simply playing - it still has many of those things with quests and dungeon houses and more vehicles but now mining is virtually pointless thereto so is base building to a point, and then they made super architectural genius zombies that know exactly which beam to target or block to destroy esp. re-enforced concrete (which they demolish like butter).
Perhaps a solution is that maybe not ALL zombies have these super abilities but some, like cops do?
All I can say is I hope you're right Roland, that this is a change they made and it's still a work in progress and just like diggin zoms and Hawaiian shirt guy, they were reimplemented. Right now, "I might feel that playing another game in my library is going to feel more fun." has been today's flavour and has been for over a month now. I'm waiting for A18 I just hope I don't have to wait almost two years for it.