Most of Dawn Of The Dead
took place indoors.
While I certainly agree that suit-and-tie interference in creative matters is a bad thing, and reflexively came down on the side of the producers, that is a pretty high budget for a cable TV show. Why is it that high? Because of all the location shooting? In any case, I don't think it's really unreasonable for them to want to keep the budget under three million dollars when other shows manage on half that.
Location shooting can be pretty expensive. Back in the day, NBC had a series called Earth 2. Putting aside complaints of quality, it was doing average in the ratings. But it's budget was high, because most of the series was shot outdoors.
When decision time came, it didn't make the cut due to its expense.