Now you're being deliberately obtuse to provoke a reaction!

Here's a pretty clear example for you that actually happened years ago when I was still practicing aikido. We were working on the first teaching ikkyo (ude osae or straight arm throw). I was a strong young buck then, and could control people pretty effectively with it. However, I wasn't doing it correctly. I have large hands and plenty of upper body strength, so I could grip the wrist and upper arm, and pretty much control whatever I wanted without actually locking up the elbow. It actually worked very effectively for me,
but it wasn't correct. As my instructor pointed out to me, I had to learn how to do the technique correctly, because some day I would hopefully need to teach it to someone without my upper body strength, and then they wouldn't be able to do the technique at all because I never learned it correctly and thus couldn't explain how it was supposed to be done.
Everything should be taught correctly. Then, once a student has learned enough to know themselves and what they're doing, the techniques can be modified to be most effective for that individual. The Japanese refer to this a shu-ha-ri. By not learning the correct way to do something, then the correct way gets lost for subsequent teachings unless it is rediscovered.
I can drive from my house to work by weaving back and forth through three lanes of the freeway. It actually works, but it is definitely the incorrect way to drive (despite the fact that a good number of idiots tend to drive that way!).