Ehh, I think the whole iOS7 UI thing is overblown.
Anecdotally we've been installing it on non-dev (tester) devices internally to help thrash our app pre-iOS7. The results have been very positive - people love the new design in general.
Even those of us on the dev team who've had it for a while have mostly gotten over the annoying bits that bothered us at first.
I really like the automatic updates, yesterday I went to look at a picture and out of no where the "photos" app was radically different, but in a good way.
I think you answered your own question. Dev builds change to fix oversights in design and logic. Not that much has changed with the over all design theme of iOS 7. Over all most of the design implemented is here to say.
The comment I was replying to (IIRC; seeing as how it's now-deleted) explicitly claimed they weren't just disagreeing with the stylistic choices in iOS, but were taking issue with specific broken sorts of things (yellow text on white backgrounds) and then asserted that Apple seemingly didn't even recognize these things as broken.
My question was how could that poster assert such a thing when Apple was indeed fixing exactly those sorts of things.
So, yes, I answered it myself, because it was rhetorical. But, no, it had nothing to do with whatever you seem to think it had to do with.
Anecdotally we've been installing it on non-dev (tester) devices internally to help thrash our app pre-iOS7. The results have been very positive - people love the new design in general.
Even those of us on the dev team who've had it for a while have mostly gotten over the annoying bits that bothered us at first.