The ACA is severely limited, but getting anything at all passed was a superhuman effort. It was a ton of ground-level politicking, taking advantage of a brief moment of Obama's extraordinary popularity. It might be his only real legislative accomplishment, but it's the most influential piece of legislation in decades.
Obama and Biden had somewhat similar styles in that regard. Obama led the country out of the 2007 recession. For the most part it wasn't flashy, just slow and steady growth without drama. (He was known as No Drama Obama among the DC bureaucrats.)
He himself was much prettier than Biden and inherently more interesting as a human being, so he got more celebrity. But his actual governance was also similarly "quiet, serious, and disciplined".
It is possible that Obama would have been a better post-Trump President than Biden--I'm certain he'd win against Trump in a landslide--but we'll never know. Certainly it is the case that sometimes it is the opportunities you have--or what the country is ready for--that makes for the success of a presidency, along with a giant gob of good luck.
No Drama Obama, No Cryin' Biden.
https://www.macrotrends.net/countries/USA/united-states/manu...
not to take away from the bill itself, but it seems like the most important thing was that Democrats just controlled house/senate/white house at the same time and couldn't be easily blocked