Facilities have improved a TON, between weight room, locker room, recovery equipment, cafeteria, player recreational clubhouse, practice fields, etc. They probably won’t stay in Ashburn forever but they’ve dumped millions into that facility and in the latest NFLPA survey the players did actually rate it all well.
You’re not wrong about the location, but any area that has richy-rich residential options (with good schools) outside a major national city hub has its appeal. Only a few teams really have that combination. It doesn’t appeal to everyone but it has its appeal.