And to clarify, the Custodian won't be 'spinning around' as it can't go on CTANH.
Besides fluff reasons, The Custodian needs it because it is not a support carrier, it is more of a front-line carrier, and should be designed to make the same course corrections as the rest of the fleet. Its essentially a Protector with more bays, so it actually does a worse job as a gunship with all its weapons pointing front than the Protector does if left at 45*
As I said before, the Kororvesh remind me of a school of deadly and agile fish changing direction in the ocean all of a sudden. Their speed is not increased by this at all.
As Sigoroth said, it also fits the flavor of the Tau as a mobile shooty force. It would make the fleet feel very unique and complete.
In a seperate issue, directed mostly at the HA's: Is there any chance of getting a third WB on the Castellan? I got some in today, and they sure are big, imposing escorts.
And finally, is there any reason why the Custodian does not have a 4th shield? If it is a fluff issue, such as Tau do not have the technology for that shield strength the same as they don't have 60cm weapons ability, then so be it, just make that clear.
If its something else, an option for an extra shield primarily would be appreciated, and also an extra turret.
If its not a fluff thing, then theres no reason the Custodian should not follow the flavor of its smaller brethren of 'Less HP but equal shielding'