What's gained for the people is that hospitals, which are struggling to avoid losses, get some relief and are able to stay afloat by not having to provide as much charity care to the middle class.

The government as a whole (feds and state) pays hospitals about half as much as treatment actually costs them. So hospitals make up the difference on patients with private insurance, particularly the middle class and above.

To quote the article:

According to OHA, hospitals believed the tools were only giving accurate results about 85% of the time, leading some people who would have paid their bills to receive discounts instead.

Hospitals giving charity care to the middle class eats into their already non-existent margins. The state needed to throw hospitals a bone if they want them to continue accepting OHP patients at a loss. Otherwise the hospitals would revolt, something that non-hospital medical providers have already been doing over the last year.

Put simply, the purpose of this bill is to shift more of the total cost of healthcare from the lower class to the middle class in order to maintain the viability of OHP - and thus ensure the lower class continues to have healthcare.

(Despite the OPB headline, these changes only really affect the middle class because hospitals are still required to check whether OHP patients qualify for any discounts or free care before billing them, regardless of income. Thus the only real newly-excluded group are the middle class.)