He doesn't have the votes to do more. That's the bottom line.
I too wish he had appointed some different people and pushed for more progressive policies, but remember how difficult it was to get what he did.
The thing is, he originally HAD the votes if he was any kind of a leader. I think he pushed for, and got, exactly the policies that he wanted. He went out of his way to torpedo anything better; it was all off the table from the start.
Until the voters in House and Senate races stop sending totally intransigent people to DC, nothing more progressive is going to get done.
The only people allowed in the races are those chosen for their obedience to the cause (of the very rich.) We have a one party system now, the keptocrat party, with an overt wing that call themselves republicans and a covert wing that call themselves democrats. No one else need apply. They won't be seen. I used to think this was a cynical view. Now it's the kindest way I can think of the system. Pity that...