The issue was LL's had zero incentive to do anything about it since they dont pay the guy the renter does. On top of that it led to VERY perverse incentives where a LL would get a shady broker to split the fee with the owner and they'd just kick the tennent out every year.
This was super common in mid/to high income apts, like the ones a decently paid software engineer would live in. In low income, not worth the trouble, in very high income to small a market.
Getting rid of that alone makes the law worth it since it meaningfully disrupted peoples lives.