Also, as for your observation that union is just a big pile up followed by a big pile up, I can totally understand that, but when you start to appreciate the skills (as well as the strength) that are actually going on in the rucks and mauls (the pile ups
), it really is an interesting part of the game... but yeah, unless someone fairly knowledgeable can explain it to you, it would look pretty ridiculous.
I actually grew up playing league and used to think the exact same thing about union, but later in life I randomly started playing union and now that I have a deeper understanding of the game, I can't stand watching league anymore.
This is going to get tl;dr and I'm sure no one cares... but... When I was a kid watching league (10ish plus years ago), the game was totally different. It was a faster, more free running game...
However, it evolved over time such that it became so fast and free running that the best way to compete was to slow down the play the ball, which is illegal, but subjective (i.e. the ref has to decide how long is too long to hold a player on the ground) and the most successful teams became very good at exploiting this.
Teams were actually employing wrestling/bjj/etc coaches to teach their players how to manipulate opponents in the tackle to put them on their back, make the face in the wrong direction, arm locks, etc, etc... Anything that would make it harder for the tackled player to get to their feet quickly and play the ball.
Ironically, this is what I came love about union. It is designed that as a tackler, if you don't immediately release the tackled player, you are penalized, or the tackled players team mates will come stomp all over you.