You do realise you'll have half a ship, not two ships then? Defence in depth is expensive, infrastructure at scale is expensive, it would be difficult and more

You do realise you'll have half a ship, not two ships then? Defence in depth is expensive, infrastructure at scale is expensive, it would be difficult and more expensive to have a bunch of small operators reach the same level considering the initial cost and overhead. I'm sure though that such equally viable alternatives could be built, but not by splitting existing ones.