To try to explain why expertise is not always needed in the specific field to add a reply consider your replay here WikipediaReferencedeskHumanitiesMPsexpensesscandalCUK  Now I have no problem with your reply there even though presumably you are not an expert on MP expense scandals in the UK  If you had said something that requires an expert knowledge on that subject like referring to a secret document on the UK expense scandals which nobody else has ever seen then it might be relevant  Since you seem to have kept to the more general topic of expense scandals in general just as I stayed with literal translations in general what you said there is just fine