Sherlock Holmes I think once said, if you make an exception to a rule, it becomes the rule. Saying 'don't want to do X but…' means you do want to do it, and don't want to honestly own up to the social backlash from being honest.
I've been critical of Q but as solidified concerns about actual behaviours (EG undemocratic Syria strike). Asking why Q isn't talking about a specific subject is redundant.
That'd be like asking why a geography teacher doesn't talk about chemistry, or why I don't talk about novels.
It's irrelevant what people don't talk about. No-one is a master at everything (attribution of omnipotence or omniscience to an individual is a sign of a cult, FYI), and your critique he isn't talking about specific subjects is redundant.
There's a lot of stuff not covered. So? How many other people talk about targeted individuals other than TIs themselves? Not many. I don't see you berating the public.
Q's knowledge set is clearly restricted to that of US politics and possibly intel operations. I've not seen any evidence to suggest any other knowledge base so far, nor am I here because of a mastery of all things, but only a specific few.