Read only accounts will not have the button. Too many users make the mistake of adding their exchange deposit account and the QR then doesn't contain their destination tag. If you're sure: tap the address and copy.

Would it make sense to have a second small balance / receive account, non custodial, with keys for that? Then to transfer excessive balance to your other read only account whenever you feel there's too much on the receive account? For now?

I like this suggestion:

I think we'll end up adding the button again, but showing a big fat warning above the QR, not to use that if it's an exchange account.