Maus, as far as I know, there was no requirement for F-35B to have a thermal burden, 'no greater than that of AV-8 or MV-22'. The USMC's total commitment to F-35B therefore attracts an additional cost of bringing other USMC assets (MOB, LHA etc) up to whatever standards the the jet requires to effectively operate. Exactly how many of those assets are encompassed in this modernisation is, I am fairly sure, a DoN&MC call, no? The Royal Navy are looking at applying TMS onto other decks and not just the QE Class carriers. Why? Well, not only is TMS able to withstand much more heating effects; it has more durability/life than CAMREX afaiu so it is seen as a wider investment beyond just F-35B. For instance, should V-22 grace their decks then the ships are already prepped.
Just my opinion.