Irrelevant? If you can't tell me what your own characters look like, than I can't take you as a writer anymore seriously than a skilled painter takes a child with crayons. That's not "hand-holding," or as you said "IQ 50," that's just the basics of creating people to inhabit the world's created for them and their stories. If you are the norm, than it's no wonder the number of reader's, (as well as the average reading level in general really), is declining. Much like the average attention span I suppose.Bah, it's an irrelevant detail unless it become relevant. I write stories were the readers can self-insert, so ak the readers what their hair and eye color are. It's only relevant if the story makes it relevant.
I think what the teacher did was hilarious, and good for a class of tiny children, but I don't write books for morons. I don't really care if my adult reader Is stupid enough to think "I drew my sword' means that they grasped a pencil firmly and sketched out a sword on their pad of paper.
Is it arrogant? sure, but IQ 50 readers don't read my stuff anyway.
It's repulsive to me, from a strictly literary sense I mean, that there are probably many people on this site alone, that agree with you.