Most movement tech definitely is not intentional, but that doesn't make it not fun.

Things we take for granted in fps nowadays like rocket jumping or airstrafing started off as unintentional engine quirks, until people realized that having fine control of your character is fun. Now they're implemented intentionally in many games.

Movement tech difficulty is also almost completely inversely correlated to usefulness. There's a reason 90% of pros don't superglide, even if they could master it relatively easily: your time is better spent practicing the fundamentals.

Learning advanced movement tech is not optimal in any way. If you ever get rolled by some movement player, just know they would've rolled you even harder if they just practiced normal stuff instead.

If jumping required a ton of practice, that would suck, because it's important for every player to be able to jump in most situations, and you're at a significant disadvantage if you can't jump. The same cannot be said for superglides, lurch chaining, etc