All good points but my understanding was that the SCS concept called for carrying 3 harriers.That sort of defeat the purpose of SCS. Taking into account mechanical problems, pilot availabiliy and luck, 3 Harriers are just too few and there is a chance that none of the Harriers are available for mission when it is critical.
In such case, there is no reason to develop SCS, just stick with DDH like the RACN or the JMSDF if one want ASW helicopters and command capacity. Do not forget SCS has a larger crew requirement and that cost money.
I'm also thinking carrying more helicopters on the (perhaps different than historical) underway replenishment ships was another option.
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