The light bulb was a great invention but what really changed the world was the lightbulb making machine. Billions have been invested in engine and transmission

The light bulb was a great invention but what really changed the world was the lightbulb making machine. Billions have been invested in engine and transmission design and manufacturing optimization. Engines are surprisingly cheap to make. Emissions and efficiency requirements have made them more complex. I wonder if the last hurrah will be an engine with fully electrically controlled valves, like Koenigsegg already has. Getting rid of all belts and chains could be great for reliability. All pumps would be electric.