Certainly. There is usually an editorial board, and even then members of that board may pass along a paper to others who have the key expertise on a particular topic. I've reviewed papers in my field precisely on that basis.(b) Would it be fair to say that some scientific journal editors are not experts in all the fields they include articles on?
I will provide an example.I would appreciate a couple of examples that highlight why you consider this. I'm not being argumentative, but constructive criticism is always useful.