I used to play Overwatch with no HUD. The game is definitely not designed around that, but I found I did decently well, and many characters have displays on their guns that relate the same info.

I know Jurassic Park Trespasser infamously used a tatoo on your characters chest instead of a healthbar to avoid using a HUD.

I did the same as you in GTA, very different and fun way to experience the game.

I always thought it’d be cool to make a no UI fighting game, with health being related by the characters appearance (ie more and more beaten up) rather than the usual top of the screen health bars.