1) What is shoveling?
It's a way to push, not lift, but push your opponent out of the dojo, with an extremely small lift above the ground, if any lift at all.
2) Why are you against shoveling?
Not against it. It might get boring if used by your opponent(s) in a row, seeing that you will use the same tactic each match. But it's still another "move", like clapping, decap openers, kicking openers...
3) Why are you not against shoveling?
Well basically because it's a fun way to come up with a new tactic. It's actually not hard at all to counter it, it's all a matter of keeping your legs on the ground, if you do that, no shovel can affect you. Like I said, it's just another random counter-able move in another mod.