Say what you will about the development team from 2000s, but that group made D2, StarCraft and Warcraft with a level of excellence I’ll not see again in my lifetime
That’s why. There was a dedication to “it’s not done, till it’s done right” and things like Reforged would have never happened.
The game is built on a solid foundation rather than these new ones that are built with the expectation of being fixed. Release early to patch functionality later