Yeah, the issue is with going through every service you've used that you might use again and changing the email. That can take many hours, depending on how many sites you have an infrequent need to use.
You can 'future proof' your mail by using your own domain and use it with your proton account.
So if you want or need to change your mail provider or self host in the future, you just need to redirect your domain to your new provider.