I think there should be some incentive for that, like make those kinds of comments a spotlight or something. Maybe make a community called “late replies” that showcases the best such replies, or have a rule saying they grant free karma (in Reddit’s case).
It would be truly wonderful if this question was asked 5 years ago.
Why? What happened 5 years ago?
Sorry I meant 5 months.
I was playing up to the premise of your question.