Well that last is easy: Accel-drive-only craft lack the "Space is a Drag" trope/quirk/feature, which is a boon for getting from 'A' to 'B' but a major flaw for fightercraft. In combat, travelling in long straight lines is a good way to get yourself killed.
Of course, now I'm imagining a craft that handles exactly as if it was in an atmosphere, except that it experiences no drag. And it has an accel drive (of course, since all mundane craft have an accel drive). Never mind, that won't work, drag is what makes atmospheric handling function and there's no way to separate speed-limiting drag from maneuverability-granting drag.
Of course, now I'm imagining a craft that handles exactly as if it was in an atmosphere, except that it experiences no drag. And it has an accel drive (of course, since all mundane craft have an accel drive). Never mind, that won't work, drag is what makes atmospheric handling function and there's no way to separate speed-limiting drag from maneuverability-granting drag.