User blog comment:VirusVirus/Debate - New Forms of Crowd Control/@comment-5266525-20150607113209

Not going to say much on any suggested new forms of CC but I'm quite sure the large number gap between 'common' CCs and 'uncommon' CCs is very much intentional because it becomes difficult to balance a mechanic in general if it's only moderately available (where balance must revolve around the assumption that they will always be stacked for greater effect).

In fact, I'd argue knockups are currently at that point of 'moderately common' right now and it's easily the most visible case of this purely because of and the nightmare he's been to balance.