This bill was never about anything other than generating more revenue for private health insurance companies. That was the singular goal and no consideration was ever given to the impact on anything else. The attitude was and as long as Wall Street owns that Yankee government will always be: "Screw the people, Wall Street needs more of their money!" Nobody running a self-funded plan is making any money from premiums. So self-funders were never considered in the drafting of the legislation. The fact that a self-funded plan can even be contemplated by mid-size employers should be enough evidence that there is far too much profit being taken by people who contribute nothing to the delivery of healthcare in this country. But those very people - the privateers - are the only people the Yankee government cares about and works for (aside: arguably, s/works for/is owned by). The additional expenses of the ACA that defenders love to talk about were the crumbs that were fed to useful idiots (think most Democrats) as evidence that their representatives cared about them. But the cost for those "good parts of the Bill" that were designed to be born by private insurers were going to be offset in a HUGE way by the windfall that would be enjoyed by the private insurers.
Nobody but Big Pharma and Big Private Health Insurers were ever even considered in the drafting of the turd that is the ACA.