My point is that if you strive for mediocrity by being satisfied with "whatever works", then what you'll end up with is mediocrity. Precision is a good thing and something that should be striven for in my opinion. If you don't share that opinion, then why would you bother to correct your students when they perform a technique incorrectly? If they don't properly engage the body when delivering a blow, it may still work just fine, despite the fact that it is incorrect. Whatever works right?
This is what I'd assumed you meant hence my post about 'that'll do'. 'Whatever works' and 'that'll do' are the same things.