It is not as simple as just hands vs feet. So much of rugby is technical skill such as body positioning and positional sense as well. A scrum in rugby league has no skill whereas in union it is all about technique. In rugby you can't pass forwards so to get forward you have to either kick it and give oppo the ball or run through a gap.
For years Wimbledon were in the top division playing compete hoofball. Defend deep and invite teams on then launch it 80 yards to fashenu and hope to pick up the pieces. You just can't do this in rugby. Territory and possession are king. In football you can not see the ball for ninety mins and defend the whole game but still win.
The skill of timing the pass in rugby is also key. You need to hold the ball long enough to draw the tackle and release it just as you get smashed. So bravery is also important.
Re hands vs feet.
Go and sprint flat out and try and pass a rugby ball 15 yards to your left and then right. If you are right handed a fast pass to the right is difficult. In football you get one footed players who never pass or shoot with the wrong foot. In rugby you don't have this option. You all need to be capable of passing both ways.
The feet vs hands argument is nonsense IMHO.
