I don't see eye to eye with WEBF on RN carriers but I think it's a very good question - why is the UK adding tasks in areas where, TBH it can add very little militarily when there are places a lot closer to home where we might be able to make a difference. To me the idea that the UK is going to get mixed up in a war over Korea or Taiwan is madness. Forces would be m much better used to try and stabilise places in N & W Africa for example where the numbers are more in our favour and the impact is much higher
N&W Africa is mainly francophile - let Manu squander French blood and treasure there. The UK's force projection in the Pacific is a positioning play for trade.