This is probably going to offend you, but I can't ask without it seeming offensive. Can you post on a thread without typing a novel? Way too long. Apparently it's done in an attempt to prove you are more intelligent than everyone else, but it's too much to read. Engines run on the same principles of combustion. I understand what your points are, but the engine temperature on a car increases faster when it's going down the road at a higher rpm than it does sitting in your driveway idling. The same principles should apply to smaller engines such as mower engines.
Btw bertsmobile you are also partially right. I haven't been around any long stroke gas engines, but I have been around plenty of old Diesel engines such as the old long stroke engines on a popping john tractor which also should be idled before shutting off. Have antique tractor pulls in my area frequently. This is a topic that is going to be argued by several. No ones opinion will change from this, so I will leave it alone from now on.