Sure, I make more than 2x the salary, but the cost of living of a bit tech hub chips away most of it. Specially housing, which has increased dramatically since Covid. Even with my big fat tech salary, getting in the properly ladder seems to be years away.
Pay less taxes? sure, but then you have to pay for everything and then some, and everything is incredibly expensive. And we don't even have children yet. I can't imagine being able to afford childcare even with my current income.
I agree that I choose the worst time to move over. In the last year we experienced drop in stock prices combined with soaring inflation, which means that both my income went down, and my expenses went up. Also it's not like I can change employers and get a better deal. Even if the job market wasn't depressed, my visa (L1) doesn't allow me to change employers. Also the latest visa bulletin pushed the current date of my visa category back a couple of years, so Green Card seems like a somewhat distant dream.
All in, I'm not sure my quality of life in this country is better (and the UK itself is not doing great lately).