Maybe Im being terrible at articulating myself: I dont know what the context of combat will be in ShB. No one does. This is a big crucial factor. Im looking at the skills and going "Hmm if I had to take a guess, there will be more damage in ShB." Cause some DPS and some tanks got mitigation/healing too. That staying alive burden is spreading out a bit. Why? If its just that healers need to be healers, then no point in giving tanks and dps utility for that. Nor if damage remained constant, buffing healing out put becomes very weird, which you do point out correctly. Im making a guess, but Im not getting pissed at SE over their design decisions because I do not know what the game content is gonna be like. That is a big big big factor in all of this that keeps getting outright dismissed by people who are "getting their knickers in a twist."
Again, I actually agree the old content thing will be an issue. It's not a new one, but its still a problem. I agree that part will be annoying.
One of the biggest complaints was the RNG factor of cards, and how out of most of them only 3 were truly all that useful. They have addressed this directly while addressing the other issue: they dont want you to be forced o bring an astro. It will have perks, but it wont be so optimized and synergized that it will be a must bring (In theory...). Even then, AST has more footing to complain than SCH. SCH is quite literally a DPS/Healer hybrid that had objectively much more DPS skills than the other two. I think that if it was gonna get realligned, DPS trimming was going to happen. They certainly would not have given it more damage abilities, and if Im right about damage output, simply adding a few extra heals will either not be sufficient OR that youll be spending more time healing so you wont have the time to fully use that DPS kit. If they give you both, then SCH becomes OP and a must pick.
WHM gets, no matter how you cut it, a buff in damage output. It's true how much that is is very debateable and relies on us seeing it live. But WHM got the best in 'QoL' cause it was the worst in regards to that. Overly big heals, inflexible mechanics, and a lack of proper DPS made it less optimal than AST and SCH in SB. It needed the most work. We'll see how that plays out though.