I am going to call shenanigans. There are tons of purely mundane fighter solutions alongside those magical ones. You are wither not looking very broadly or ignoring the ones that don't fit your argument. They exist.
....not to mention that there is, in fact, a small (but thriving) OSR community that has fighter classes so mundane that they look at the 5e Martial Classes and say, "Hold my mundane beer, magic pants."