Gotta give credit for Ion finally giving a Q&A where he doesn't start a wildfire of protest on the forums. Maybe he can learn. Granted, he didn't mention flying at all, lol.
I honestly think class design should be decoupled at this point from the expansion/patch schedule, and just worked on by a team all the time. "Balance" the way they work now is a total unicorn. They spent a long time on classes in Legion, and I think it's showing it was just too much to handle in that time period. Classes should evolve when ready, not by artifcial gates like an expansion or patch. Yet again, there was a massive mountain of feedback from players, and yet again, the devs are unsure what to do. I don't know what the problem is. Is it how they work internally? Is their "design by committee" method keeping them back?
I understand what they were attempting with this revamp - it's like classes were a painting, and by the end of WOD that painting was so overpainted and changed so often it was muddy and unsalvageable, so this time they scraped the paint off and started over. But they had too many paintings to do, in too short a time. And they seem to be very reluctant to go too far, they're being very minimalist now.
Or, they should just throw their hands up in the air, say "Look, classes are hard. There will never be "balance". Abilities will change when we change them. Just go play the damn game." and be done with the hand wringing and over-thinking of it all.