The way I see it, being willing and able to adjust and change technique is a form of self development.
That's a good generalization, but we're talking about a specific case here. Speaking to the particulars of this
case, I think that it really isn't for a student of your own rank, who is supposed to be acting as your uke, to make the decision that it's time for you to self-develop and learn to be willing and able to adjust and change technique. Your fellow student, your peer, is not the one to make decisions about your training -- even with the best of intentions, which is often not the case. Let's not kid ourselves, there are a lot of people who use the guise of "helping" as a fig leaf for ego-gratifying displays of their own superiority.