That's an interesting point. It's not wrong that, because they do so many events , they can't rely on a small roster, when some fighters fight once a year, sometimes less.
I also think MMA would be more interesting (and less dangerous for the fighters) without extreme weight cutting, but I think the UFC won't do anything about it.
I honestly don't know much about how efficient ONE's weight cutting prevention rules are ; from afar it does look like a decent idea. I'm maybe cynical but I'm under the impression that whatever rules are enforced, everyone is going to try, and eventually find a way to cheat the system.
Those tests would also have to be run by the UFC, I imagine that speculations about shady favoritism would go through the roof...
But I still agree with you, I just doubt anything will actually happen (unless, like it happened for ONE, someone in the UFC actually dies from cutting weight)