I'm just saying that old Blizzard used to develop games for "gamers", because most devs were fans of their own products and they had the freedom to do so. The whole debacle on Blizzard which was brought by Diablo Mobile, is only a visible symptom of what's been happening during the last 5-8 years.
This kinds of news towards Relic or other companies isn't something to be surprised as you said.
Diablo mobile is for Chinese market where Blizzard's fan of WoW or Starcraft like to play on their smarphones.
Diablo3 isn't enough old to get its retirement period from the Western store. Now yeah maybe Western fans were maybe expecting another extension.
Note that I fully agree Blizzard work quality went down with Starcraft and Diablo. But WoW is still an amazing piece of work (even if I don't play it since long) and they always try to renew the experience with every addon. Can't deny that.