Your employer is screwing the employees via a terrible grandfathered plan. Any new insurance plan after ACA would have a maximum deductible equal to out of pocket maximum, which for 2019 was $15.8k for non HSA and $13.5k with HSA.
But I’ve never heard of a deductible actually being set equal to out of pocket maximum or even anything close to it. Even the bronze family plans on healthcare.gov had deductibles of a few thousand.