Because quality isn't a concern any longer. They've become accountants and revenue is first and foremost. That's why we're getting a new system to release multiple characters every quarter, so they can dump more garbage on us via quantity.
Quality has been lost and they're not concerned about finding it again. If they were concerned with it, they'd do actual testing, they wouldn't keep breaking everything they release, and bugs would get fixed in a much faster manner.
Quantity means we spend more money on the game, which is what this new subscription model is. You can pay 20, 40, 60, 300 a month to have all the new shinies! Why? Because new shiny priority. Old stuff, irrelevant. (which includes bugs that affect players negatively.)