the super sub sucked.

You end up with a situation where clubs are just refreshing 1 player at 3/4 time, and then a last quarter injury means you're still down 1 man, with a fit player ready to go that can't come back on. It introduces too much in the way of grey areas.

And what if your ruck or key forward goes down? great, you're bringing in a 5'6 rover.

I like the way soccer does it. Since the beginning of time you've only been allowed 3 substitutions per match. If you use those up and you get another injury then tough luck, you play a man down. It's very rare to see all 3 subs used with more than 10-20 minutes left in the game.

I think if they introduce the limit, it needs to be quite low. Get the game focused around the players that are on the field. I would look at something like maybe 8 per quarter.

It isn't really an attempt to change the way the game is played in my mind, it's more trying to revert to the way the game used to be played. The bench was only used a handful of times every quarter up until the mid-late 2000s