Not the best example, but here’s one of entering a location and a monster appears right next to you in a puff of smoke https://youtube.com/shorts/6tyJ_zw0OMA

This completely invalidates being careful or stealthy. I can’t feel paranoid if I know it’s not a mechanical counter to lurking enemies. I’m just going to run straight in because either way, enemies will suddenly appear so there’s no advantage to not just running straight in, and that doesn’t feel tense.