I'm not convinced there's a problem but only as long as you own your own domain. Using gmail (as in blah@gmail.com) is potentially dangerous, either from "Google decided to lock you out of your account" to "Google has started charging $X a month [more than you can afford] for Gmail".

I was an early Gmail adopter, and have hundreds of logins that use my gmail address. I'm now in the process of getting sensible and moving all my logins across to a domain I own. It's still using Google (as in Gmail / workspace) - the free edition - but once I'm done I won't be beholden to Google if there's a lockout or whatever. Pain in the ass though it'd be to move mail servers and to lose my archive (well, any bits I haven't downloaded / synced via IMAP), I'll be in a much better position to Do Things if I can just repoint the domain to Some New Email Service in the future.

It's a pain, but I'm doing it. Slowly.