600nm v 450nm looks to me like a 33% performance margin on one of the key measures for what we now appear to be calling CEPP ("Carrier Enabled Power Projection" or somesuch management yukspeak).
And Mr Boffin's points about the space required for Dave-B to do its funky RVLs are well taken (let alone at night with punk weather - ugh...!)
Personally, I'm also not convinced that the when push comes to shove on the US defense budget in an era of sequestation and deficit reduction whether Dave-B will actually survive anyway. After all, the USMC have just got 72 more Harriers.... cheep, too!
S41