It's not ideal, but one workaround that viewers seem to like is to occasionally produce an 'inbox' video answering the better or most common questions received.
Sort of like a mailbag but without the parcel ripping.
The main disadvantage is you lose the immediacy of a quick one line written comment.
(and in my case an excuse to test a lash-up 1970s cassette recorder dynamic mic with the modern camera!)