Well, Diablo 3 was made by World of Warcraft developers as none of the original Diablo team had any say in the development and a good chunk of them are on now working on somewhat successful indie projects for the masses such as Path of Exile and Grim Dawn.
Video game industry evolved in a huge business ruled by the suits managing numbers and following strict market study and rules. Long gone are the days a couple of passionate people could make a fully fledged title and keep their integrity. Nowadays they need to successfuly take first hand at least half a million from their target audience to even be able to do anything.
The same goes with AoC, beside café break TSW devs working now and then on this title, how many of the original team are left? Is there any passion left when it comes to the development of this game? I let you imagine the rest.