The JP community isn't a monolith. There are healers there who would like to actually have something to heal, just like here. Not to mention, they're maybe a third of the playerbase if we're being generous. And before you say "but SE listens to them" let me assure you they do not. We keep saying it on the English forums but the Japanese forums say SE only listen to EN.
As has been explained many times before, healing doesn't become harder in Savage. It's only fun during prog before you memorise the fight, then it's right back to spamming your one DPS button and waiting for the boss to cast an extremely infrequent raidwide. But that whole argument is stupid anyway because what you're saying is that you're fine with the vast majority of content being painfully boring for most people.