Its not adding to the complexity at all. Heating up the engine makes it easier to start. The faster you start it the quicker you can run it. The quicker you run it the quicker you can tune it. The sooner you tune it the quicker you can have fun. You see it as a waste, I see it as a tool that may increase ease of engine use and possibly engine life. Some people are this way about fuel, plugs, batteries, radios, servos and much more.