Ian, MV-22 vs CH-60S was never a like to like capability comparison in the first place. The "Marines in Blackhawks from Amphibs" cost too many manpower billets, part of why it was (thank goodness) not adapted.
CH-60S was, in a lot of ways, a stupid idea that remained stupid. The USN could not afford to build them properly: with the small footprint of the F and B, due to budget constraints of the Clinton era and a "Joint" imperative that had BFA to do with function. On the other hand, it helped keep the Army's multi year UH-60L procurement contracts alive and the industrial base warm ... so it goes. Whatever they were trying to save they spent on the continual systems integration problems getting them into IOC ... late as usual.