uote]But what about on a 787 From what I can tell the reasons not to offer it are.A. the fering is not water tight/structurally able to withstand splashdownB. the g-load requirements are too high for current payloadsBoth of these are serious problems but I don't think they are insurmountable.
787 is designed to be pressurized, a fairing is not and in fact does its best to prevent a pressure differential during ascent. They are insurmountable in that they would leave no performance for a reasonable payload
The design of a standard fairing is incompatible with LAS. Fairings were not built with LAS in mind.