I recommend that you submit this feedback via the in-game form. It’s unlikely to be seen on the forums, and it’s an important issue.
I thought the nameplates seemed different, but I had not identified why. I suspect any changes to nameplates are because of the widespread use of Plater. I also don’t use it, but basically every article/video recommending add-ons “everyone should have” includes it. It might as well be part of the WoW Starter Kit at this point. Since a large number of players prefer it, they could be taking steps to make it less necessary.