[laurentl]

I have an email address with a personal domain, and my "legacy" Gmail account. I like having an email address with a custom domain, and I think that it's a (weak) signal about your technical aptitude/geekiness. If you want things to just work, Fastmail, protonmail and presumably other email providers will let you manage this without any hassles. I use protonmail and I haven't noticed any dropped emails.

The main pros & cons, apart from vanity, are IMO about security and robustness. With a custom domain you can change email providers, or you can recover from being locked out. (Just read any horror story about the day Google decided to freeze an email account). OTOH the custom domain name adds one more point of failure, either for delivery (if you have to handle SPF/DKIM yourself) or security - if someone gets into your registrar/NS account, they can re-route your emails. So you want to make double extra sure your accounts are locked down tightly.