I suspect they are aware of the discontent (though an acknowledgment would be nice); however, I also suspect that they don't have any clear plans for what to do about it, so for now they are staying silent and letting things play out...
As bad as it sounds, the game has grown a lot with Shadowbringers, so from a pure numbers perspective if the Healer drop-off isn't big enough to cause a major disruption (which, honestly, it hasn't been) then from their perspective the current Healer design is 'fine', or at least not something that needs to be urgently addressed (as any major change is going to annoy those who do like the current design).
