I would love to hear what was "radical" or "divisive" about Obama's policy. A significant portion of the country disliking him because of his skin color doesn't make his policies "radical"
I happen to think the policy was a good idea, and voting to keep it in play was the best vote of John McCain's career ... but it was definitely both radical and divisive.
Now, much of the "mandate" has been stripped away, health care remains a mess, and access is far from affordable, but you can't really blame that one on Obama.
It seems quite ironic, given the frequent complaints about the inability of Congress to either govern effectively or fix health insurance (for many and various definitions of "fix"), that the ACA was so divisive. At least it got passed! Yet given the opportunity twice (2017-2019, 2025-2027), a politically viable alternative hasn't been offered up by opponents of the ACA, let alone being able to fully repeal it.
The thing is, the divisiveness comes from one side - conservatives who were and are determine to oppose literally everything.