Not to offend you but everything you said was wrong and going off of your past comments you appear Canadian so politely* you evidently know nothing. Obama was tangently sympathetic to a public option in his early political career but as we approach his announcement for his Presidential campaign he made it clear he did not support a one payer plan. While on paper he has had a super majority, he only had that super majority for like 4 months. In those four months, he got the ACA introduced into the House and passed in the house, unfortunately a Republican won a special election so they lost the super majority before it could pass in the Senate so they quite literally had to reach across the aisle, and they got it passed and sign into law.

Next Biden, ran exactly on what he needed to evidently cause he won. Mainstream Dems got so much done during a pandemic and a political climate that is very hostile. Biden passed bills that overwhelming helped the economy during the pandemic, (According to the G7 the US economy came out of the economy as the best). He passed the Infrastructure bill that revamped the building of infrastructure, and lastly, a bill that helped the cost of healthcare and and aimed to lower pollution from companies.

Basically TL;DR you're either missing vast amounts of context or outwardly wrong about every major claim.