The Scrum is a vital part of what makes the point of difference between Rugby Union and Rugby League (and to a lesser extent American Football)
That point of difference the "contest for possession". It exists in the form of the Ruck, Maul, Line-out and scrum. In the other games (apart from the recently reintoduced "one-on-one strip") there is NO contest for the ball. Each team gets several turns with the ball then have to kick it away.
The Scrum, the Line-out and the Breakdown is what gives Rugby Union its appeal for players of all shapes and sizes; short and stocky for props, tall and lanky for locks, tall and athletic for loosies, short and nimble for scrum-halves etc. Anyone of almost any body shape can find a niche in the game.
However, if you look at Rugby League players, apart from a few rare exceptions such as Gary Freeman (short) and Barrie-Jon Mather (Tall), you'll see that they have a "sameness" about them; many of them look like they were cast from the same mould.
Admittedly, the Rugby Union scrum is not currently the contest it could and should be. Props are routinely allowed to bind illegally (and that is all props from all countries, no exceptions) and scrum halves are being allowed to feed the ball almost straight into the second row. If the powers that be can sort this out, then the scrum will become an even more important component of the game that it currently is.