Well, i guess if you knew that they were coming then yes, your crew chief would keep the engines warmed up. If however a radar tower is bombed, or there are a handful of low flying 110s from that experimental unit coming in under radar detection what would be the most probable scenario? That's right, a cold start.
Something nice to have in a dynamic campaign, if you don't protect your radar towers then 3-4 missions later you get jumped with a cold engine. And if someone doesn't like it, there's a reason we have difficulty and realism settings
