If you look at the sticky in suggestions, we do prefer one idea, one topic. If we have mega idea threads, we can’t read it all and we can’t get an accurate vote on what matters. If you have like 50 suggestions, we would prefer 50 topics.
The items suggestion thing is a unique thing, and it’s something we created. We have lots of item suggestions and that’s just better to keep in one thread so we don’t have to track hundreds of item topics.