Sorry but that’s bogus from an operational perspective. The only cross deck requirement for the RN with the USN and MN (FR) is for training and continuity of carrier capability (ie a joint carrier force with France or embedding a squadron in a USN CSG for a deployment a la the USMC). There is no way cross decking on CTOL carriers is going to be anything other than a few safety related one offs (caused by the nature of CTOL carriers). Of course with a STOVL fleet there is no need for training and continuity cross decking because of the much greater flexibility of operation.The problem with this argument is historically the UK has only been on high-tempo combat operations with one NATO ally in the last 20 years, and that's the USA - GWI, II & A-Stan. Whilst the RN may train with the likes of Italy and Spain, from a war-fighting and joint operability perspective the US, followed by France represent the two primary maritime partners today and in the near future. Being able to operate off those two countries strike carriers has become the primary driver for the RN.
What the RN losses from going from STOVL to CTOL is emergency landing on non carrier flight decks and utilisation of LHDs as Forward Arming and Refueling Points (FARP). That is LHDs like a Wasp or a Juan Carlos/Canberra class that is operating as an amphibious assault ship rather than a sea control ship can provide a Lilly Pad for close air support operations. Significantly boosting time over target without reliance on land based IFR but also weapons deliverables.
Only the inexperienced would consider a Queen Elizabeth with 36 F-35Bs as not being a Tier 1 strike carrier. In generation of strike fighter sorties it would be superior to a Nimitz class with their current and planned air wing. It would be able to do so 24 hours a day as opposed to only 12 and in any scalable package from 1 to 36. It would also be able to position itself independent of the wind and much closer to shore without the need to establish safe circuit patterns for recovery.Whilst continuing with F35B would have given access to European and USMC STOVL platforms, it does not compare to what are considered today as being the tier one asset in a Navies arsenal - that being the conventional Strike Carrier. With the FAA now firmly embedded with the USN flying SH, they can jointly develop doctrine as the F35C's come on-line in a training environment that cannot be duplicated anywhere in Europe.