I don’t know if you meant to use QA here, but nothing about any of this would fall under the purview of QA, at all. There wouldn’t even need to be a reason for any dev to spend time on these so-called “considerations” because they aren’t really considerations for what Enemy Percentage is there for in the first place.
I mean, I have no idea what your design experience is, but this is just not how design works. There’s absolutely a distinction between whether users or customers have a legitimate annoyance with a thing, and whether they’re just making up their own problem. That’s part of why design principles exist.
Moreover, if you’re going to get into claims like something being “brought up ad nauseum”, or “people arguing”, or “many people feeling that makes X a waste of time”, that’s already enough to raise eyebrows, because WHO. How many is this supposed “many people”? Are you the only one arguing about this? Is it a thing for 12 people on this forum? Hundreds? Thousands across forums and discords and in-game and whatever? 1% of the M+ playerbase? 10%? 25%? Are half the M+ playerbase feeling disgruntled about this? Which number you land on (and how you’re even remotely attempting to land on this would interest me) is kinda revelant too.
The idea of spending dev time, hours of effort across the various teams and personnel who might touch a change, and however much that change costs, would need to be weighted against that. No one’s going to be spending time and money to satisfy 5 people on a forum. Not to mention the actual downsides and impacts of making such a change, and how it would alter the approaches available to certain other players.
From all appearances, this isn’t some pervasive topic that is dominating Discords and Guild Chats and Forums. About the only person I definitively know who’s bothered by this is you. And given the design has an explicit purpose that we know about, and is happily satisfying said design, the idea that it’s poorly designed because you said so is … silly. Even if you found evidence that a hundred or so people agree, that still does not constitute a design flaw. I guess maybe you could argue that Blizzard could communicate their intent with Enemy Percentage better to newer players who have not been around all this time, and therefore might be ignorant to its history, and dungeon design in WoW, but that’s not a design problem, and more just a factor of how time operates.