What about yearly or by incident payout limits? Like max 20000$ per year in treatment or the like. That's what most of the plans canceled by the ACA were limited by.
My plan had no lifetime limits, generally awesome coverage, HDHP, and was ended. I don't believe it's because it was non-compliant, but because it was no longer economic to underwrite with 1) guaranteed issue 2) substantial minimum/preventive benefits paid per year (so, essentially a guarantee of $300-400 in reimbursements on a $1200 premium per year, with some odds of $100k or $1mm or whatever payouts in rare cases too.)
My insurer got out of the individual market.