The reason we don't remove these posts in the suggestion board, is so we can see how the community feels about a suggestion. If we disallow these kind of posts, then a lot less people will give their opinion on it, and we only get to see a small part of how the community feels about something. Sometimes it's not really necessary to say any more than +1 or -1 either. Also, some people might have issues with the language to properly explain themselves. So, we'll keep allowing these kind of posts, so as many people as possible can give their opinion on a suggestion.