Actually, padding a ball away needs most of the same skills as a front foot defensive shot. You need to do everything bar get the bat to the ball. Other than that,if you're just padding away with no idea about line, length, turn, whether the ball is a straight leggie, wrong'un or flipper, you don't stand a chance. All the bowler needs is a straight one or flipper, or to put a few more revolutions on the ball, and you're as good as gone. Padding up is A) often the safest way to play a spinner. A batsman's job is to protect his wicket and score runs. You're proposing we take away an avenue through which to achieve that. And B), if a spinner is pinning you down, padding him away is often a strategic plan to frustrate him into giving you scoring opportunities by altering his line or length, or both. Cricket isn't always about flashy cover drives and big sixes and shattering stumps, as I'm sure you know. More often than not it's about the battle between two good players out in the middle. I love watching a great leggie like Warne being padded away and left alone, because it's a battle of wills to see either who cracks first and changes their game, or who can break the stalemate with either a brilliant shot or incredible delivery. It's part of what Test matches are all about.