Its depends on the set up, size of the studio. Sometimes designers do multiple jobs or they stick to one role.
Like any other job. Doesn’t mean they don’t have knowledge but it just how the company is run.
As for DLCs, you can plead, show stats and say reality, prove the player base its dying off, literally because of poor bug/debug management but that will never change a thing with DLC.
Like everyone said, its preplanned most likely but DLC stops for no one.
Like it or not, right or wrong.
But what they’ve been doing is patches and debugs on the same boat as the DLC.
I had a convo with someone here a while ago about the goods and bads of that kind of set up, it being monthly and all. Huge patch brings more stacked problems than a smaller patch and in longer increments.
The postive is they’re at least on a schedule and doing both.
You can fight and argue all day with it but reality is this is what they’re gonna stick too.