Here's a thought.
Maybe folks could resist the urge to write comments that are basically answers. I mean try it for a week and see how it goes. Trust that other people can write genuine answers if you don't have time to do so.
One reason is exemplified in the comment thread resulting from someone answering via comment instead of writing an answer or waiting till someone else wrote an answer:
The length of rope/the length of a houseThe length of rope/the length of a house
When someone writes an answer-in-a-comment, very often the learner engages with that user in a lengthy back-and-forth discussion. This discourages me from writing an answer because I think the user has been serviced by the discussion. Second, such discussions are messy and should be relegated to chat. That takes time to do, if it gets done. If it does get done, then we have a blank question with no response.