Because doing the job has never been a top priority for either:
Sen. Richard Burr praised North Carolina's former GOP governor, Pat McCrory, as “the only one in the race that can win the general election" for the seat Burr is vacating. “Pat McCrory has a commanding advantage," Burr added.
Behind the scenes, Burr is even less subtle about next year's Senate battle. One Republican senator said Burr is “telling everyone that McCrory is the only one that has a chance to win.”
McCrory was nothing more than a rubber stamp for Legislative Republicans, and his former Budget Director Art Pope. The boldest thing he did was sign bills as a lame duck that stripped Roy Cooper's powers after the 2016 Election. Half of McCrory's short gubernatorial career was dedicated to cheerleading the ConnectNC Bond, but when BergerMoore stripped out the actual connect part (roads & broadband), McCrory folded like somebody holding a pair of threes. Here's more, if you can stomach it: