Careful. You’re asking the wrong questions.
In this discussion, “TBCC design goals” refers to “ultimately, what the experience felt like in original TBC”.
What the design goals literally were in original era TBC are slightly…not as important because Blizzard has already stated a willingness to make #somechanges.
It was a TBC design choice to not have some of the things that they’ve already changed/added.
So when I hear the phrase “TBC design goals” in the context of TBCC, I think those are goals that are intended to recreate or mimic the feeling of playing original TBC.
Drums were not a widely used phenomenon back except in the latest parts of the life of TBC, Sunwell, by the highest performing guilds.
This time around, drums was going to basically be the world buffs of this expansion, where everyone was primed to respec LW and it would be a natural part of raiding life, even in mid-core guilds. This was something that was changed in an effort to make sure the experience of the original is properly recreated.
The regen buff mechanic was completely new and discovered going in to TBCC during beta. It was a mechanic that existed for the whole of original TBC, but nobody abused it back then. It was simply not something anybody, on any sort of findable record, ever utilized. Yet, the feral rotation going in to TBCC was primed to look like spamming trollblood potions every 2-3 seconds in order to utilize the mechanic. This was hotfixed and changed, because it better realizes the original TBC experience, because nobody did this back then even though it existed.
These changes are accounting for differences in player behavior, in an effort to balance the experience towards how it was back then and not cause too many “meta shifts” that are alien to what actually existed back then.
I don’t see how this question is relevant to anything. I don’t care the ways how TBC’s design is different to Classic or Wrath’s design. It’s irrelevant. We’re playing a recreation of TBC. The only design ethics (I prefer this phrase) that matter are TBC, and TBC alone. When I’m playing WOTLKC then wraths design ethics will be front and center for me.