It sometimes crosses my mind that as the number of airframes gets smaller and smaller it becomes more worthwhile for any potential adversary to try and take out some of them on the ground "at home"
with 20 B-2's for example if you could take out even 3 or 4 on the ground you'd have really compromised USAF capabilities
we'd look a bit silly if someone takes out 10 Typhoons
numbers have a force of their own