It’s not a mindset, it’s just a fact. And diablo IV doesn’t really seem to be failing, pardon me for saying so.
There is nothing especially useful about your feedback. Blizzard has no obligation to provide you a list of what they are working on or anyhting else you posted. Could they do it? sure. Is it a good idea? Probably. However, you’re not entitled to it just because this is an online game. “live service” just means it’s an online game that runs 24/7 that recieves periodic updates and support. It doesn’t mean anything else. Diablo III was a “live service” game, as is Overwatch, and any other game that can’t be played offline.
Those two words do not mean there is any special obligation from the developers or Blizzard itself to say or do anything other than update it and keep it running. That is simply the bare minimum of course, and they are and will do more than that, but they’re not going to do it because you demanded it, they’re (probably) going to do it because they planned to anyway. We don’t need daily up to the second updates on all their future plans. Stop worrying and enjoy the _____ game for a while before you beg for news updates.