I think in addition to the other points on this page, the thing that keeps coming to me is because I think deep down inside, Biden knows where the fault is.
The Supreme Court's primary role is to decipher existing laws, existing precedent, and figure out how it should be interpreted in a different era. Yes, I know due to how politicalized everything is, sometimes questionable outcomes come from the Supreme Court. But at the core, their job is to interpret existing law and precedent.
Congress' role is to actually pass new laws for a new era. It can be argued, they've done a terrible job at that because they're busy trying to appease their base. Because they're so divided, very little acts, with any substance, are being passed at the federal level.
Expanding the court might result in the outcome you want today, it may not result in the outcome you want tomorrow.
But expanding the court also continues to give Congress a way out of making tricky compromises and laws, so they can continue fundraising on outrage, and yet do very little about things by blaming the other side.
It sucks to type that because I’m all for helping young adults get higher education. But I do agree with the court, it can’t be at the expense of executive orders because then we’ll be on a crazy hamster wheel with every president. Congress needs to do their dang job and create a college bill that everyone dislikes and likes.