And only... what, Italians, can write books on the Romans?

That’s a bad analogy because the qualification is being born in a region not acquiring knowledge thru working. an equivalent would be only electrician can write a book on wiring.

	▲	rplnt 9 hours ago \| parent [-]
		Do you mean wire and tool manufacturers? Electrician is mostly a user. Or to avoid flawed analogies - should books on Windows, Office, ... be only limited to a small subset of Microsoft employees? I'd assume the book is for users, what does it matter if the author contributed to the project? And that's still ignoring that evangelism is also a valuable contribution.