After playing pretty much everything at 60fps since the beginning of this gen, I couldn't really stand 30 fps. Just so sluggish.
That said, I think Starfield did 30 fps very well, especially for an fps. I decided to play Alan Wake 2 at 30 fps, because the visual gain was worth it. Even though there was no 60fps mode in Plague Tale: Requiem at launch, I checked the 60 fps update and if I ever decide to replay the game, I will probably stick with 30 as the visual downgrade at 60 is too noticeable.
If the controls are responsive and motion blur implemented well, then I can tolerate 30 fps but I am not really a fan. Some games are just fucking terrible at that framerate.