I will agree to the 'craters' idea on two conditions;
* some serious penalty must be done against people who bomb bases at low alts
* there must be some way to clean up the crater mess quickly.
I wouldn't mind if enemy bombers slip in from high altitudes and bombs the runway into drilled pulp. But as it is, when there are fights with equal numbers of pilots engaging at a front, a buff can slip in NOE and just spray bombs everywhere at low alts.
They don't even need calibration or specific targetting, and they certainly don't care if they die after the job gets done. That's why they come in at such low alts in the first place - hence, the term "suicidal buffers".
Bombing runways is extremely easier than hitting specific hangars in that a bomb run with low-accuracy can still dig holes into multiple runway directions at the same time. Imagine a suicidal B-24 with massive load of 500lbs bombs just squirts its load at the middle of the runway and gets shot down immediately after. Just one successful dweebery and the runway is paved everywhere, making it difficult for fighters to take off.
Besides, if such easy mode bombing would become so effective, then there must be a means to repair it easily as well... somthing like one M-3 field supply filling up 20 crater holes with a single resupp drop.. or something..