Yekke2 – arguably Avraham Avinu didnt do Hachnosas Orchim because it was an official Mitzva (it was after all before Matan Torah).
Maybe he did it because he understood it to be G-d’s will. And it is regarding this, that Chazal say it is greater to do Hachnosas Orchim than be Mekabel the Shechina – also a way of carrying out G-d’s will.