...so that the junior has the opportunity to learn a very very important principal, which is actually something meant to be applied to a wide variety of situations
This is exactly the way my teacher and myself train and
Techniques are a means to get something across. That something is the important bit, not the technique.
It takes proper concentration, context and stylized form to get to that point (of interest). You study.
In actual combat many more aspects come into play: what is the fight about, emotion, weariness...You fight to live another day.
So proper and precise training is important. In the past I have had experiences with highly experienced students of my teacher (dojochos with decades of experience) where they 'broke connection' because my attack was not precise enough and thus adapted their technique to the new situation I had (unknowingly) created. Off course much to my confusion. They explained what happened and why.
A few years later I started my own dojo and encounter similar situations with my own students. They wonder why everything in Aikido is stylized. "That stuff won't work in combat." Nope, you are spot on: it won't. But still you will be prepared!
Many threads go on about the effectiveness of Aikido, but hardly ever consider what you concisely described. Perhaps your post should become sticky...