>I haven't had insurance for five years because the (major, national) providers who cover what I need aren't available on my state's marketplace (NY).
As someone who purchases insurance from the NY marketplace, that hasn't been my experience.
Initially, I had a plan from one of those (Anthem/BCBS), which provided pretty good coverage because they increased my premiums by more than 50%.
Now I have a local (New York State) provider (Fidelis Care) which costs less and has a (fairly) low deductible through the state's marketplace.
That said, many providers are actively hostile to marketplace plans. Back when I still had an employer-based plan, my company changed insurance providers. I called up my GP to make sure they accepted insurance from the new company, but before I could even describe the scenario, the office person at my doctor's office raised her voice and said, "We don't take any Obamacare plans!"
Which was quite interesting, since back then many of the major national insurance companies were offering such plans, including the companies (both old and new) my employer was contracting with.
All in all, I've been fairly satisfied with Fidelis Care, although I wish I could do database queries of their "Explanation of Benefits" records rather than having to wade through PDFs for each visit to a provider.
All that said, I don't know your circumstance (none of my business) so you may have needs that I don't. I wonder what those might be that a "national" insurer might offer than an in-state provider doesn't, especially since the ACA specified requirements for all health insurance plans, not just those on marketplaces.
Although I'm not sure how no insurance could be better than some, unless you're against medical care in general. But my use case isn't yours and I'm sure you make decisions that are best for you.
Edit: Added a few thoughts to address parent's issues, clarified my point about coverage to be more clear that I'm emphatically not calling anyone a liar.