This is largely a myth to be honest. Anyone who actually lives here and knows any genuine Rugby fans would know that all that sort of talk comes from people who are exclusively League fans. However, most people are in favour of rules that encourage less kicking and more ball in hand rugby.
The thing is that a lot of people up north don't understand is that in terms of scale Union in Australia is about the size of League in England (the difference being the Wallabies are still competitive - unlike the English League team); i.e. it's incredibly niche. The game is now 4th behind Australian Football, Rugby League, and Soccer, in that order. As such a lot of the commentary on rules is from generally derisive League and AFL fans.
If I were to offer a suggestion, I'd like to see how the game would look with a shift in the way penalties are given. Automatic yellow cards for a third consecutive ruck infringement/offside play would have a positive influence in my view; it would make rucks cleaner and open up play.
I think the difference is that rugby union in Australia is able to appeal to the whole country, at least for a test match. Rugby league in England does not do that.