PC sparring has easier controls, faster movements, you can move diagonally up and down, etc. The list is rather long. Obviously the staff of Classic feel the same way otherwise they wouldn't have stopped allowing it for the GST. Also, sparring with a 4g is at least the same controls as a 2g, and they both use the same movements. Don't even say using an ipad is unfair, everyone says they are terrible to spar with so your argument is invalid.
The fact that your arguing means you realise the advantage of using a PC so your trying to keep it so you can spar iPod players. If it's all the same to you than why do you care?