Ever driven an automatic?... The transmission is designed to shift at the optimum points for power and economy. The optimum shift points depend on engine load (required acceleration) and speed. Low for easy takeoffs...delayed shifts for heavy acceleration. An equivalent car with a stick should be driven the same way.
I've seen too many people "show" me how to drive a stick when they really just enjoy listening to a highly revving engine.
95 E320 Cabriolet, 131K