The new platform is not going to get the benefits the forum offers for exploring what the suggestions would entail.
Maybe a suggestions forum here could clear up the clutter from the general forums, and offer a place for users to discuss and refine ideas before posting them to the suggestions page. It would also help to organize votes.
The biggest benefit to the suggestions page is it allows sorting by popularity and rank, which isn't always immediately clear on the forums. It also allows them to tag, track, and respond to ideas as a whole rather than individual posters.
It would be nice if there was a way to archive suggestions that have been tagged/responded to and refund votes. But then it would be hard to see the relative popularity of the archived suggestions. On the other hand, the way it is now earlier suggestions have a disproportionate advantage over new suggestions. Maybe logging how many votes a suggestion had at the time of archival would be of use.
Overall, it honestly it's just a distraction and additional work to moderate for them really. Feature creep by developers is already a big problem, feature creep by users is a disaster. It's a nice gesture to show Scirra cares about is users, but that can also backfire if those suggestions don't get acted upon for long periods of time. Hopefully the disclaimer is effective.