>>535946092
There's a reason they called it the flying fortress, bomber battles boxes were a good idea until it was realized how many swooping attacks/flak guns they were encountering. Once a bomber loses speed because of damage or engine failure it's an easy kill. You can also read up on the bomber mafia if you want to understand why fighter aircraft didn't get prioritization until it was a little too late.
Tldr: fighter aircraft hard for big lumbering shitbrick to counter