Don’t get attached to phones.

I do this. Its great because of catchall emails and the ability to make one address per merchant. Then if a company leaks your email or gets hacked, you can simply change the email from hacked-company@domain.tld to hacked-company2@domain.tld and block the old address.

It also is good for ownership as you said. If Tuta gets purchased by Google (for example), then you can simply pivot to any of the many other email providers and not rely on a company being not evil.