I never said it was trivial, I said it was possible. In many places, it's actually very easy. In others it takes some work, but we're talking about de-googling your life, having to put in some work is already implied.

At least around here, I can walk into a bank, sign a few papers, then that bank coordinates with my old bank to transfer all my direct debits, move all my money and notify all my periodic creditors (employer, social security, tax office...). Peer-to-peer payments (like splitting bills with friends) are usually done by alias (phone number or email) on our instant payment scheme, not by IBAN, and my new bank will take care of rerouting that too. And if for whatever reason someone has my old IBAN and tries to send me money in the future, they'll get a rejection and will just have to ask me for my new one, no big deal.

As for "in a week", come on, you're just being intentionally annoying. Obviously there's no guarantee. If they don't have root detection now, after everyone has had it for a decade, there's probably a reason and they won't implement it any time soon. And if you're just supremely unlucky and they actually do it right after you switch, oh well, you wasted and afternoon. Definitely less time wasted than trying all the million different root hiding techniques that probably don't work anymore.

But you don’t mind paying more and having a worse service IRL when you could just buy a cheap Pixel phone with GrapheneOS on the side ?

Think of it like a car key. You wouldn’t have a crusade against car keys right ?