I think there's some psychological effect here.
For example, let's call the tier Incarnation is in as the "cooldown tier" (even though Soul of the Forest is there). And the lvl 90 talents are the "shapeshifting tier".
Maybe... just maybe... we all hate the shapeshifting tier so much because it is lvl 90. They are the last talents we get access to. They are the top talents! And, yet, they are tools to make us do roles we didn't choose to do - and I hate that. I specced balance to be a caster, I don't want cat tools, I certainly don't want stronger heals and I DO NOT WANT TO TANK!
If they were to swap the shapeshifting tier and the cooldown tier, would we continue hating the shapeshifting tier?
On a different point, Heart of the Wild and Dream of Cenarius certainly feel weak. But the numbers can be tweak. Even so... how effective am I going to be in those off roles if I lack the tools to do them propperly? Most of our 'hybrid' toolkit is being taken away.