The issue with voting based forums is they tend to cater to low quality mass appeal comments.

More often than not an informative comment, while maybe not being downvoted, won't be the top comment. Instead, you'll see really low effort "zingers" which make it to the top. Those are further piled on with a flood of comments trying to one up each other.

So, you end up often needing really strict moderation to curtail this problem.

Chrono ordering suffers the same issue, somewhat, though it doesn't have the pile on problem (not to the same extent).