Tophurioussaid: doesn't seem productive. hide a post without reasoning and the poster may not know what rule was broken and won't be able to take corrective action later on.
I've hidden a few posts recently that were just outright spam or intentional flaming by users who definitely know what they're doing/know better so I didn't feel it necessary to "preach to the choir" so to speak, but I'll make a point of making it known exactly why, regardless, so people can stay informed.
Thanks for bringing this up! Community Manager for Jagex