I agree with that comment to a certain degree, with a caveat. I absolutely LOVE discussing subjects outside of my expertise. In all honesty, my only areas of electronics expertise would be RF and antenna circuits and industrial control instrumentation, but fortunately these areas are broad enough to have familiarity with many aspects of electronics, enough to "speak intelligently" so to speak. By discussing them, I reinforce and often deepen my comprehension, and sometimes correct misconceptions.
So I think it is fully appropriate to comment, but be prepared to concede mistakes or else defend your position with supported facts, and most importantly clearly state your gaps of knowledge to avoid confusion. The last part is usually the most difficult to do.