Before ACA, insurance had a more traditional "insurancey" role by excluding pre-existing conditions (aka managing moral hazard) in order to make money via premiums. In the "guaranteed issue" world post-ACA, insurance companies have pivoted instead to extracting as much money as they can from an increasingly vertically integrated ecosystem (PBMs etc)
Before ACA, insurance had a more traditional "insurancey" role by excluding pre-existing conditions (aka managing moral hazard) in order to make money via premiums. In the "guaranteed issue" world post-ACA, insurance companies have pivoted instead to extracting as much money as they can from an increasingly vertically integrated ecosystem (PBMs etc)