The purpose is good suggestions often get a decent amount of votes but no replies, and because they get no replies they get buried.
You see the problem ?
Maybe the people who already upvoted it have nothing to add and maybe there is nothing to add.
Why should an already good suggestion get listed higher to get more replies ?
What type of replies to do you expect ?
I wonder do you want a chance for a suggestion which the devs see anyway or are you looking for attention ?
Can you also imagine that good suggestions would then get buried by ones that cater for upvotes ?
It would turn into an attention seeking competiton and not a helpful focused sugesstion subfourm.
What if fanboys met to upvote their great idea only to bury other ideas without organised fanboys while the latter maybe
deserves more attention and discussion ?
Another question is why should upvoted threads get more replies and attention by being listed further up for potential replies ?
What if the topic doesn't offer enough potential or simply noone's interested ?
Or maybe the suggestion isn't as good as you think ?
IF you think a suggesstion isn't thought through, which is why you would want replies, maybe post it in the general forum instead of in
a subforum that likley most ignore most of the time anyway. It's for posting suggestions. If you want attention and debate go general forum.
That would be my stance.
Would be interesting to hear what the moderators think about that, as i would be annoyed if a discussion of a potential suggestion would be
moved to a relatively dead subforum. I suppose it should all depend how you phrase your thread title and opening post, so that it's clear that
it's a thread asking for input and debate and not a finalised suggestion, as the latter is i'd say the reason for the subforum.