Blizzard has always made games that already exist.
This used to work because they had a god tier engineering team during a a time where video game technology was rapidly changing.
But Ex-Blizzard devs have less money, less talent and are in an environment where video game technology has been stagnant. So their ideas just end up being worse versions of games that already exist.
Dreamhaven is a looking to be a bit different with trying to make smaller games more appropriate for smaller teams but it doesn't mean anything they make is going to be a success.