Why language matters
Fundamentals are taught through a shared vocabulary, and that's not a minor point. When everyone uses the same terms for the same movements, explanations are faster and learning sticks.
Corrections become immediate. "Elbows in" takes two seconds to say and one second to fix. Describing the same error might take a minute.
Drilling gets easier. A new student can pair with anyone in the room and get useful reps, instead of spending the round negotiating what the drill is supposed to be. This reduction in confusion also means less of the quiet frustration that makes beginners drift away.
Learning becomes portable. A student who knows what a "knee shield" or "underhook" is can watch an instructional video, read a book, or visit another academy and connect what they see to what they already know. Without the vocabulary, every source is a new puzzle. With it, everything builds on the same foundation.
Vague words make vague movement. If your definition is "sweep the guy," your technique will be vague too, and in a live roll you rarely have time to deliberate. Under pressure, you reach for what you've already named and filed away clearly. A technique with no name, or five names, is hard to recall, hard to describe, and hard to troubleshoot.
Names let you break techniques into parts. "Grab the leg!" is a single blur that can only be repeated, not improved. Being able to say exactly where a movement went wrong is what turns a mistake into a lesson.