Re: Pay
That's just not true, what costs, and where? There's massive regional variations here in US, but the UK has some of that too especially in housing.
Where were you on 100K Euro, I made 230 in Dublin and certainly didn't feel like that much once taxes and housing costs were taken into account.
My 4 bedroom house with a garden and a garage is comparable in price to one in the home counties, despite being in one of the most expensive neighborhoods in California. All my utilities are lower, as is my insurance, food costs etc. Cars, appliances, etc. are less, let alone the price of petrol, though arguably that's not a good thing, but I'll enjoy my 5 liter Rover until it dies then go electric.
Again despite California being high comparative to rest of US, my taxes are less here than they'd be in UK. 10% sales tax rather than 20% VAT, income plus property taxes work out to about 25% of income. Traffic sucks so can kind of agree with the commute part, Americans think nothing of driving an hour here and there, I've been mostly WFH for twenty years but it does suck to have a two hour drive to a meeting once or twice a month. But South East England ain't great on that front, if we came back we'd look at a village in Surrey or Hampshire most likely and have exactly the same kind of lengthy irregular commute.