I'd say that my movement/positioning is fairly consistent but it always seems like something new or random happens, like slipping or getting stuck on a surface more than usual. I would like to know if I'm just going crazy or if it's actually a part of the game.

I've read in a couple of places that creating TASed runs for this game is difficult because of RNG. Not exactly sure what RNG would impact but it'd still be at least a little helpful to know.

I'm not angry or blaming RNG for failed runs or anything, I'm just kinda curious about how the game/physics engine works. Feel free to spill all of your knowledge out to me.

Yeah, I don't know. Slipping does seem very random sometimes. A big part of the skill involved in this game is efficiently recovering from a failure, whether that failure is yours or the game's.