In any case, there are no plans to drop non-chatmail server support. If you don’t need mobile Google/Apple-mediated push notifications and have your own self-hosted or local friendly email server such as provided by your hackerspace, at least create a second fallback account there in case your chosen chatmail server is down or you have trouble connecting to it. But if you only have a “webmail” such as Gmail, there is no advantage using it.