I have to take your word for that, but is it not somewhat of a technicality rather than an indication that it is a 'pile of junk'? I can't imagine any sensible situations in which one would use the meter "for mains voltages" when there was anything plugged in to the transistor socket.If it's got a transistor test socket on the front, it's a pile of junk. The presence of that socket also means any Cat ratings on it are lies at it's totally unsuitable for mains voltages.
What does see odd (to me) is that the socket for the 10A range is unfused, but everything else is fused - is that common (I've never really looked for it!) and, if so, why?
Kind Regards, John