Seems the importance of the standing-wave has been over-emphasized. One of the authors of one of my references says that a "standing wave" doesn't meet the definition of a wave at all since it doesn't transfer energy and probably shouldn't even have been called a wave. The superposition principle gives us permission to consider the two traveling waves separately and add the results to obtain the total. There is never any reason to consider the standing wave as a stand-alone entity. It's very existence depends upon the two underlying traveling waves without which it wouldn't even exist. Some people have gone so far as to assert that the standing wave causes the reflected wave to cease to exist and the result is a "mashed potatoes" version of energy on a mismatched transmission line. IMO, that is just another indication of the dumbing-downward spiral that is evident in the American educational system. Mathematical curiosities do not alter or create reality.