I can understand where OP is coming from, but this is one of those issues that has no real middle ground when it’s laid out. People who don’t want transmog don’t want anyone to have it, because it’s an environmental effect that they’re looking for and if you give people the choice to ignore it, it effectively ruins the entire premise.
I’m on the side of the road that likes transmog. I enjoy it, I think it’s added more to the game than it has taken away, and I think the sacrifice of what you wear = what is currently relevant is outdated. This game is old. Very old. Without transmog, there would be several expansions worth of gear and raids that would never be touched. As it is, transmog runs are a fun way for people to revisit old content in a lighthearted fashion and that is worth something.