Diablo Immortal =/= Diablo IV
Diablo Immortal is a F2P mobile game co-developed by NetEase. Built FOR mobile, which is why its monetization (while avoidable) is as awful as it is. Diablo IV won't be any of those things.
If anything, I think it's fair to be concerned about the outcome because of the internal changes made to D IV team during its development. Hopefully at launch it'll be better than decent, but overtime I see it being more than that. Much like D3. They have plenty of things to reflect on to show them what success means for them, D IV, and its fans. Will they do it? Hopefully. I think they realize what is as stake on those platforms.