HSA limit is $4,300 annual, how does that protect against total ruin? That's a hospital trip in a Uber and a few tylenol.
So, if you're young with minimal healthcare needs, you can get multiple benefits:
1) High-deductible insurance that's (relatively) cheap but still protects you against financial ruin
2) After 10 years of maximum contributions, you'll have ~$10K in cash for emergencies and about $33K in retirement investment contributions.
Be careful about non-ACA-compliant plans. They're cheaper because they engage in sketchy behaviors that leave you without coverage when you need it.
*Well, except Medicaid, Medicare, etc.