This is—in theory at least—more effective, since it forces pharmaceutical companies to compete on price. And if they don't, Californians still have access to a source of cheap insulin.
Also, insurers would have incentives to mandate the $30 version since it means lower cost on their side and they don't even have to reflect that in insurance premiums (which they don't since they're competing with each other).
But 95% of the time, your doctor writes a scrip, your pharmacy fills the scrip, and if the sticker price is “reasonable” you pay and walk out.
One reason I can think of is that a law might be more politically "durable" than a contract with a third party to produce insulin. But on the whole I think I'd rather one less law.
Costs over that are passed on to the consumer via higher premiums.
The CalRx is $30 total.
I think insulin specifically and medicines/drugs in general might be another area that CA leads the country in modeling how to manage prices and overall cost.
i.e. No matter your opinions, make your best case for why this is a good idea.
See also: strawman
And there are great reasons not to 'steelman.'
https://thingofthings.wordpress.com/2016/08/09/against-steel...
Also, there's no practical difference between an actual shortage and a price rising so high that many people can't afford it, like it's already the case with insulin[1].
[1]: https://www.hrw.org/report/2022/04/12/if-im-out-insulin-im-g...