The more I see questions being closed as off topic because the member who asks seems a bit lost or not at ease with the system being used, I would say that **professional capacity** on SF seems to refer as being a guru or a demi-god.

We seem to forget that it's impossible to know every single technologies or fields in IT.

We also seem to forget that people need to start somewhere. Is an system administrator with 6 months experience less of a professional?

If so, then SE would need to add new site for near-professionals.

Is it possible that a network administrator who does magic with switches and routers might not be familiar with the inner working of Microsoft Active Directory or Syslog-ng?...absolutely.

Is it possible that a Linux administrator who codes useful bash script in no time might not be familiar with Cisco IOS or Oracle DB?...absolutely.

The problem is, in both situations, the user might want to ask question outside of their professional knowledge.

If they do, then starts the "this-does-not-belong-here" dance. All based on the wrongful assumption that the person is not a pro.