Well they're still working on bugs behind the scenes. I'm sure the data gathered from this last beta will help shape the GM and hopefully destroy the bugs. If not, 10.0.1 will be easy enough to release after the new hardware is out.
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It could happen, but I really doubt it. Otherwise we wouldn't have seen beta 6 coming 3 days after beta 5. Just my 2 cents.
Yeah we cant really go by that logic anymore, though I wish we could. But thats just the reality of the way software is done at Apple now. The past few years it takes them till X.2 or X.3 (6 months later) to really get most bugs and glitches ironed out. Hell me and my buddy both constantly have issues copying and pasting things into the messages app after a year of iOS 9 and have to hit copy twice to ensure it actually freaking works (Hardly a coincidence).
To top it off Music, News & Messages are pretty much ground up redesigns. As well as many many changes system wide. This is pretty much the biggest release of changes since iOS 7. I'm not making excuses here but I would be shocked if there aren't some larger bugs still present in 10.0. Agree or not, Music.app was pretty much a disaster for the first couple months after release.
This is the first time ever I'm heavily considering holding off on an iOS update. I'll admit I (along with many others) don't quite trust Apple to release software that "JUST WORKS" out the gate anymore. Nothing is ever perfect but Apple has not had a solid iOS .0 release since iOS 6.
* For the sake of argument please spare me the canned "excuses" or reasoning why I'm wrong. This is my opinion and observances.