The only arguments I had even thought up to support my musing is that a Vessel with racks would probably be a ultra-specialized shock attack vessel in the vein of the recent GTVA corvette generation, and in all honesty probably would BE one of those corvettes with the racks bolted on. More like a unique "upgrade" for a small number of Bellerophons as part of a specialist squadron.
They could be handy in the sense that, say you're jumping to your target, they of course detect your subspace signature, your not a Destroyer and theres only one of you, so they arent expecting Fighter Craft, dont have countermeasures in place, and when you finally exit subspace you bleed off four wings of fighters damn near instantly and take everyone by surprise. Damage to the racks is a non-issue, as said fighters can simply jump home.
I would also argue that it could increase the time Fighters can remain on station, due to not having to jump to the target in the first place, but I dont think FS has ever actually given a crap about fuel and logistics.