There is a difference between shadow-banning a user, and limiting an offending post. I, too, believe the best way to combat trolls is to simply ignore them – but that is not what 80% of the online community does. Each troll post still inevitably gains traction and will keep getting bumped up to the top of the category list. A solution like I’m suggesting would help keep the overall site discussion going the right way, instead of degenerating into useless trash or getting knocked off topic.