a decent commercial brand
There's the problem, though - finding a decent commercial brand. Purina Beyond has no dyes or byproduct goober in it, so I like that for a discount/grocery store food in a pinch, but normally he gets Taste of the Wild (from Pepper's), which is grain-free. And honestly, the Beyond is only a buck or so cheaper than the better food.
Dogs have lived on Purina and Alpo for decades and managed to survive, just like kids eat Kraft Mac & Cheese with hotdogs and it doesn't kill them. But some people just want the better nutrition food.