It's just not worth it. Panels have become so cheap and productive that you don't need to have them track the sun. A motor and a swivel are already prohibitivel

It's just not worth it. Panels have become so cheap and productive that you don't need to have them track the sun. A motor and a swivel are already prohibitively expensive. They also introduce a lot of failure modes to a system that is otherwise low-maintenance. It's much, much, much cheaper to just plonk down a few extra square meters of panels instead.