Instead what I got from this post is that the bugs are being rapidly fixed, and it is a major update for a reason, because of the breaking changes. Well, that's cool.
It reminds me of people bitching that iOS 6 runs slow on iPhone 3Gs. I don't see how abandoning an old version to make something awesome and charge for it is a “dick move”. You paid for it, and you decide whether to pay for the update.
I wouldn't be suprised to learn it was hard to backport some fixes because of the breaking changes, and I don't see anything immoral in deciding it just isn't worth the effort.