tbh, CounterStrike comes to mind if you want to talk about the cutoff for "professional" vs "indie" look + feel for FPS.

When it was a mod, it was blocky, and all about straight gameplay, but when they launched as a self-contained game (under Valve?) they re-did textures, menus etc. and it felt like a full game. In my mind, that was a nice shift that the user could actually notice, and made it professional.

It could be possible to compare vs. other projects as a benchmark?

Don
have a great day