I'm not sure which problem this is trying to solve.
But it will hurt the light & medium bombers. They always struggled a bit to find their role in AH, now it will become somewhat more difficult to find a reason to up them. For example, I very much liked to use the G4M for porking bases. 4x250kg was just enough for ammo two small or one medium field (if you survived long enough, that is). While a drop of one 250kg bomb is nominally still sufficient (combined DR of ~1800), my offline tests resulted in a lot of duds despite having a good impact point.
IMHO, if anything, the factory buildings are the one who could have used a boost. A fast suicide jabo can quickly do damage comparable to a heavy bomber formation, and is almost unstoppable.
But then, the whole strat setup is in a kinda weird place these days and could use a total rebalancing.