Golden Calf changed the Way Torah was Given

 Sforno (Shemos 24:12) “which I (the Lord) have written.” If it had not been for the sin of the golden calf, the entire Torah would have been handed to the Jewish people (Moses) as a signed and sealed document just like the Tablets with the Ten Commandments. Instead, Moses wrote down the Torah at G’d’s command. In fact, Moses only brought the Tablets to within sight of the people in order to smash them before their eyes, so that they would understand what they had forfeited due to their disloyalty to G’d. This demonstration of Moses having smashed the Tablets was designed to shock the people into penitence.