I'm saying this, because you started with "to be fair...". As if this was a good explanation for the double-standard your parent poster mentioned. You can still fix it, even though it now takes more time than never having used Gmail at all. Complaining about "the effort" just reinforces the double-standard.
Use something like Fastmail. No hassle with setting up your own domain or email server (although you can use a custom domain) and they offer a tool to migrate your email from any IMAP server (and probably from Gmail as well).
Edit: added 2nd paragraph