Root Sports Northwest is a sister channel to the three AT&T SportsNet regional sports networks — Southwest, Rocky Mountain, and Pittsburgh. So it makes sense that Root Sports Northwest would simply be called AT&T SportsNet Northwest. While Warner Bros Discovery has 100% ownership of the 3 AT&T SportsNet channels, it only owns 40% of Root Sports (Seattle Mariners own the other 60%). This is likely why it keeps its old name.