Are you upset they aren't making as much money as they possibly can, rather than what is available?
Chasing the ultimate amount of money isn't a practical strategy.
> So they should have basic, agreed standards of what appropriate agreements look like, negotiated as a group.
That certainly makes it faster - you don't need to negotiate individually, instead "take it or leave it", and hopefully it's a good deal for both.
But it's not like such an agreement is required, if someone wants to negotiate something else, nothing is stopping them.
And you can be sure that some indie company will decide to leapfrog the studios and do exactly that with non union models.