Mine would be arbitrarily slowing down a character to maintain horror in a game. I get if there are reasons like age, injury, or location that could provide context, but don't turn my legs into molasses because you need to time the jump scare just right.
The first time I played Skyrim I didn't know about fast travel until about 30 hours in. It was actually pretty fun that way, I should try it again. Lot more zen vibes, enjoying the soundtrack and sky, and random encounters on the road were fun. Only time I ever randomly ran into Cicero.
Skyrim at least has horses, carriages, and boats for fast travel alternatives. Try playing Oblivion where the only way to fastly travel is fast travel. Morrowind still has the best fast travel system that isn't fast travel though.
I liked that Fallout 4 had the teleporter and the vertibirds if you're playing without fast travel, like in survival mode.