I think Arteta is just bad at rotating players. People speculated about White being shot physically, but he came in and was fine against Brentford; it just took three injuries for Arteta to actually play him. Ethan basically never gets more than a few minutes anymore despite playing well at the start of the season. Hincapie didn't get a minute until November and now he gets every minute. Lewis-Skelly was apparently a regular last season, and he never gets a start even though we all know that Calafiori's knee is going to give in at some point.
Unless Rice and Zubimendi force Arteta's hand by getting injured I don't think Nørgaard is going to play much either. That in itself is a bigger issue than the gap between first choice and backups.