Plus nothing ensures the bank you switch to won't up their "defenses" in a week.

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.

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

Which is good, right? One less thing to lose.

Can you name one?

And the workaround is always far more work than I want to do, for virtually no upside for me.

Having all your emails on Gmail and used for external services (bank, insurances, etc) is a different story though. I prefer to pay my email provider, at least they will care a bit more than they do for a free account...