It's kind of a big deal. A lot of people have basic simple things go wrong with their health early on--allergies, asthma, acne, diabetes, etc. And that could have been a stigma making you uncoverable except through an employer, until this. The ACA did things like this, and more, pretty well.
I would like to think the will to carry out "repeal" while not at all replacing, should falter--but they still haven't got anything to replace it with.