All situation is weird. When in roleplay it doesn't make sense when it's supposed "balancing reasons". Problem is that disco developers lack unified wholistic position towards this issue. As a result some factions doesn't get stuff because of "balancing reasons" even when it doesn't cause imbalance, while others get everything when it doesn't make sense in roleplay. (reavers use black dragons at 90, sairs at 75... dfq?)
Corsairs and BW seems to be the same. Or this collision between BW and Corsairs is nothing more than a relic of past times which at current stance has no justification but continues due to inertia. Should a regular corsair use BW tech? probably not, for corsairs thier ships are signature of their nation. It's like an emotional bond. But anyway, emotional reasons do not reduce technical capabilities. Keeping in mind that BW tech is not technology which is kept in secret it shouldn't be hard to tune it to become compatible with all sorts of weapons. Expecially when corsairs live in same regions these designs are the most popular or were developed.
Be greenlighting BW ships no harm would be done. Since corsair tech is better anyway in most aspects. But this is not about which tech is more efficient, but about making sense. And a lot of these decisions does not make sense at all.