Don't know if this is any help -- When I was a reporter the Internal Revenue Service (Inland Revenue) classified me as "a non-exempt professional." Although my boss expected me to be very "professional" in my work.
This IRS classification meant that I got paid overtime for working more than 40 hours in a week.
We reporters tended to think of ourselves as professional writers although some few (reporters are all notorious Ayleurs) claimed we were craftsmen.
Anyhoo ... I think it depends .. I would much rather have a mason build my chimney than a "Professional" Architect