I don’t think I’ve ever needed to do a wheelie other than when I’ve been messing around in the street. It’s not exactly a vital skill when riding off-road.
Never needed one full stop. Still occasionally have a half arsed practise, then remind myself they are useless anyway.
I really wish I could hold a manual at balance point though. (I can get it up, to clear an obstacle).
Also wish I could do endo turns. I can do it in a flat carpark, but on a trail tight enough that one is actually needed? no chance.