A Protector is designed to meet Imperial cruisers on even terms, and whilst lacking the great bulk and structure of a cruiser, packs comparable firepower.
Imperial Armour 3.
Yes, the FW rules we are replacing to give the kor'or'vesh fleet more 'Character'.
So you might denounce it from that pov, perhaps not. Your call.
Also because of the fact the Custodian is fewer in numbers, more precious to the Tau and less likely to be present in small engagements. Thus the Protector should have its own attack craft, hence a single bay is needed: enough to thwart enemy AC (as every Protector has one), plus to assist its missiles and also to engage small targets during raids (transports etc).
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I don't denounce it, I agree it is an ok idea. But I wouldn't quote doctrine behind it, because Tau are all about different caste systems and working together, if anything they would have radically different ships filling specialist roles. All I'm saying is a non-LB would be a cool variant.
With your ITS idea filling the space of the LB, actually.
And indeed, the Protector is obviously more manouverable than the typical battleship by pure hull design.
Eldar are Eldar, and I agree the Demiurg ship could use more hits.