That is not how the presidency works. A president's domestic power is limited to the veto, agenda setting, nominations and calling the shots at domestic agencies. A president does not dictate the price of milk or bread, set childrens' education curricula, determine prescripition drug prices, or any of that by himself.
What is different between the two is their policy outputs. Trump handed out a massive tax break to the rich, disrupted the functioning of public health agencies during COVID, made a terrible deal to exit Afghanistan that was tantamount to unconditional surrender and undermined NATO. The bill during his term to assist small businesses was rife with flaws that make it an easy mark for scam artists, who were legion.
Biden pushed for legislation to repair our crumbling infrastructure after decades of budget starvation, got behind vaccination, helped pass legislation to curtail prescription drug prices, mended NATO fences, assisted Ukraine and generally acted the way a president is supposed to act. He cleaned up the messes the previous administration left as best he could. In some cases, such as the Afghanistan withdrawal, he was found wanting, but he didn't make that dog's dinner. It was handed to him.
Buchanan was a hop, skip and a jump away from treason when he actively sabotaged federal efforts to put a lid on what would become the Civil War. Ditto Trump on January 6th. There's a reason presidential scholars rank him right down at the bottom of the barrel with Harding and Buchanan as the country's worst in history. It's a travesty that the treasonous fool can get anywhere near a major party presidential nomination, much less get one.
It speaks to what a bunch of uneducated rubes the Republican Party has become. I don't know why anyone would be surprised - rural schools have been starved of funding, and thus good teachers, for decades now. His voters substitute faith for knowledge, certainty for the complexity of the modern world, a desire for a king for recognition of the value of rule of law, and cheap rhetoric for policy of substance. They're just marks for a flimflam man who has delivered nothing except the end of Roe v. Wade, unfettered access to automatic, lethal weapons and court decisions they don't understand, that batter them to better pay off the 1% that make the political contributions Trump needs.