That's because both Trump and Biden agree on the big, overriding philosophy of the welfare-warfare state and are simply disagreeing on how to manage it. Big deal.
Consider, for example, the welfare-state way of life under which Americans have lived since the 1930s. Wouldn't it be great if either Trump or Biden were challenging this way of life at a fundamental level?
He could be showing that Americans lived without a welfare state for more than a century. He could be throwing into question the entire New Deal philosophy of President Franklin Roosevelt that brought about America's conversion to a welfare state. He could be showing that the welfare state is a variation of socialism, a philosophy that has proven to be inherently defective and economically destructive.
That would be an extremely interesting, exciting, and thought-provoking campaign. It would revolve around critically important issues that every American should be discussing and debating: What is the rightful role of government in a free society? Should government be taking care of people?
Alas, we don't have that type of presidential campaign because both Trump and Biden believe in the welfare state, especially as reflected by their joint commitment to the crown jewels of the welfare state, Social Security and Medicare.