Why do propeller aircraft remain useful for close air support?

Are propeller aircraft returning because jets are poorly suited to close air support?

Jets can perform close air support, but helicopters and propeller aircraft can be cheaper to operate, while propeller-driven drones may take an increasing share of the mission.

Jets are not inherently ineffective in close air support. The distinction is economic: helicopters and propeller aircraft may provide the needed presence at lower cost. Many current drones also use propellers and are likely to compete strongly for this mission. The return of propellers can reflect affordability and persistence rather than a simple failure of jet technology.