So many metaphors, I don't know where to start!
Right now the egg basket is planned to have two varieties (or there are two baskets, you choose!); Typhoon and F-35B. That has always been the strategy for the RAF - now for the RN, it will only have F-35B so IF the Program were to fail catastrophically, we would be left with nothing to put aboard QEC. If that was likely, I'd agree with your sentiment. But IMHO I don't see that happening.