One of the main points of creating this new Hive Improvement community was to allow ideas to be proposed and get attention without needing to make a proposal first. In other words, you can get visibility somewhat similar to the extra visibility of the "proposals" page, without having to pay the proposal fee.
The advantage of this method is you still get some attention and feedback for your ideas (as opposed to a random post, where you don't think anyone will see it, apparently), but the blockchain doesn't have to do the special processing for voting on it.