I've got a question if you don't mind. I'm set on moving to iCloud too for my domain as the only thing I really care about in the G Suite is just personal email via custom domain. Should I change the Apple ID of my account off my custom domain ? I can see a scenario where I can't access my iCloud because I need access to iCloud to verify the email.... I could move the domain records, but this won't be a 5 minute job.