Well, that's not entirely true old chap. For example the current scrap doesn't really have an air threat so the B1 can do CAS on their own...given that they can employ PGMs and have the Sniper, a million or two bombs and about three hours on station.
Equally they can launch stand off stuff from 'quite a long way away' so can avoid CAP/ QRA with a bit of planning.
Or, given their endurance they can probably hang around waiting for the CAP to bingo out and then press on as if nothing had happened.
The reason they got a few more losses than most at Flag is that the Nellis airspace is pretty small and the regen points for Red Air are pretty close to any ingress/egress for the strikers.
Wasn't being serious chaps - big B1 fan, me!