Many of our allies could use a first or another carrier, yet we keep scrapping these. Why?
Because its worn out.
Ships get old.
A knackered old ship like this would cost a fortune to crew and maintain. One of the key advantages of the Queen Elizabeth carriers under construction in the UK is that they are having a lot of automation built into them to reduce the need to have a large crew. The fact that they have the latest in marine gas-turbine technology in their powerplants means that they are a lot more fuel-efficient as well...
Because alliances change.