We agree entirely. Losing a carrier would be horrendous. But warfare isn’t a game of absolutes.
For example: I think that Typhoon gives the U.K. a reasonable capability, but I can think of a number of systems that would make it absolutely irrelevant in a very high end conflict. I don’t think we should can it because in the more likely scenarios it gives utility.
I think we should spend our time campaigning for things like an ARM for Typhoon or some form of (actually useful) MRAD/ GBAD for the British Army rather than knocking a basing option for F-35B that seems quite useful.