Everything you said about questions applies equally to answers.  A few days ago I posted a one-line answer (to this question) because I was in a hurry.  By the time I got back to it, 15 hours later, it had accrued two downvotes – as far as I can tell, simply because it was too short (lacked explanation).  I proceed to expand on the answer, so it’s now over 50 lines long.  I engaged in several rounds of comments with the OP, who eventually accepted the answer.  But the downvotes remain, (presumably) because the downvoters never realized that I had updated the answer.

Since my initial answer was correct, but just code-without-explanation, I would hope that people would have used conditional downvotes if they had been available.

Everything you said about questions applies equally to answers.  A few days ago I posted a one-line answer (to this question) because I was in a hurry.  By the time I got back to it, 15 hours later, it had accrued two downvotes – as far as I can tell, simply because it was too short (lacked explanation).  I proceed to expand on the answer, so it’s now over 50 lines long.  I engaged in several rounds of comments with the OP, who eventually accepted the answer.  But the downvotes remain, (presumably) because the downvoters never realized that I had updated the answer.

Since my initial answer was correct, but just code-without-explanation, I would hope that people would have used conditional downvotes if they had been available.