S.T.A.L.K.E.R. 2 is an amazing game, it really is. I spent 80 hours on my first playthrough, and apart from relatively minor annoyances (some bugged quests, and UI bugs) I had an absolute blast. However, I kind of feel, as do many others that in its current state, the game lacks longevity because there is no true endgame, no crafting, no NG+, no custom difficulties, and no real economy to speak of that would entice players to come back for a second round immediately after the credits and spend hundreds of hours playing it again.

While I don't think every game needs to be infinitely replayable and played for 10k hours (truly, I have nothing but pity for people still playing Skyrim after 15 years with waifu mods), if you are looking for something I described above, you might want to give G.A.M.M.A. a shot while waiting for GSC to implement all those changes.

It's basically a completely free, stand-alone mod for the original trilogy that contains all areas from all three games, vastly improved graphics, extremely involved and difficult crafting, tons of micromanagement (limb-based health system) and great emergent gameplay using the original a-life system. In contrast with other "magic" modpacks for Bethesda games (Heartland, etc.) that take two afternoons to install only to crash in the main menu because a mod has not been updated for 2 days, G.A.M.M.A. actually works. It takes a while to install, and you need a Discord account to access the installer, but once it is done and configured, it needs a few small tweaks and that's it.

The learning curve is pretty steep (on a new game, you won't even know how to open the map because the PDA needs to be equipped manually in the inventory and needs batteries to function) but do yourself a favor and stick with it. If you give it ~15 hours to learn how the gameplay loop works, and where each cog fits, this game will give you at least a thousand hours of gameplay, for free.

I myself discovered it ~2 weeks ago and since then I clocked in almost 200 hours, and I'm not even partway through.