I understand the basis of this suggestion and where you're coming from. However, I think it would be detrimental to the server to do this. I personally value new player's perspectives a lot, and they are always really helpful to me. To stop them from making suggestions would hurt more than it would help. New ways of viewing things and thinking about things are really useful, and is something I take into consideration when working on new updates.
Not to mention there's the issue of some experienced players who may have only recently joined the forums but have played the server for a long time. They wouldn't be able to post suggestions either?
Overall, yes some new players do post suggestions that wouldn't be doable here, but they also provide a useful perspective and their thoughts have value. Thanks for your suggestion, though!