"Time expended" is a huge factor for the players in this game. Whe hauling bombs, it's often all about a) time efficiency and b) absolute time spend. That's why you see so much more jabos porking fields than bombers, and so many more low-med altitude bombers than high altitude ones.
Yes, but should a player successfully shut down a field just because he left his bomber on auto-climb and went to eat dinner?
JABOs are difficult to stop - if they too spend the time to climb high enough and pick up speed. It is still less time than a bomber, but also the potential damage is much less (compare to bomb load x3 bombers in the formation). To kill multiple hangars in a JABO takes several sorties, so climb/travel time is multiplied and the first hangar is up by the time you come again to drop the 3rd. As it is, bombers hit more reliably from 20,000 than a JABO diving on the target (with the intention to pull out of the dive that is).
JABO porking of ords is more common because a single La7 can pork it by strafing. But that is a whole other dweebish issue. Make it require bombs and you'll see more need for heavy bombers to do the porking.
