I'm not sure about the "more professional" comment - gordon@shephard.org looks fine to my eyes. Regardless, lots more useful shorter domains than that are available - for example, mohene.{com,net,org} all appear to be available.

The username part matters a lot more than the domain. ladykilla69@gmail.com isn't a particularly professional email, even if it does have a well known domain.

Okay, I understand.

Nothing of the kind is considered by anyone.

Nobody considers johnsmith@odek.com a better applicant than johnsmith@lumberjackservices.com.

Even if the job is for a hacker and not a lumberjack.