Historically fighters that were tied to close escort missions protecting bombers performed poorly when compared with “free roaming” fighters. Fighters are much faster than bombers, so even throttled back a little they would have to perform all sorts of zig zaggy kind of patterns throughout the formation so as to not overshoot the bombers too much etc.
As the war went on tactics changed and the attackers would send out fighter “sweeps” ahead of the bombers trying to draw the interceptors out into a more “even” fight. The defenders learned to try to avoid getting into these dogfights as they lost much of their advantage.
Other tactics such as “top cover” where fighters would escort from a few thousand feet above the bombers so they could swoop down with extra speed/energy when they were called to engage.