Jaina new look in World of Warcraft doesn't bother me much. She is older and perhaps found the metal boob plate doesn't fit her new bitter self. Note I'm not giving it a standing ovation either, it just I think it fits.
However, going as far as retcon her look in Hearthstone stings a bit. Blizzard may be trying to be more... what's the word? Family friendly? Respectful? Woke? They will have lots of work ahead thou, especially in the Night Elf territory. Maybe that's the reason they burned Teldrasil?
Anyway, even if all AAA companies out there shy away from fanservice, there will always be people out there to carry on this "noble" tradition.