we share a similar taste for westerns, as half of your top 10 make my top 10 too.
But then, you also wrote that:
"Before the 1960s, and dating to the silent film era of the 1920s, movie and television Westerns were extraordinarily popular, but very formulaic. With only a few exceptions, there were good guys and bad guys, and nothing in-between. The actors looked like they’d just stepped from the fitting room at J.C. Penny. The dialog was clean and predictable. Even the violence was clean, with maybe a spot of grey, at most, to reveal blood. If a good guy was shot, he always managed to take a few moments to gasp some poignant last words.
Women were limited to secondary roles as wives or sweethearts. American Indians were always portrayed by white actors, and they were always the evil aggressor. If Mexicans were depicted at all, they were generally lazy and subservient (a notable exception being in the Marlon Brando vehicle, Viva Zapata). "
… sounds like you haven’t seen much westerns before 1960.
The US western from 1939 to 1960 was in fact a very varied bunch of films which can’t be described with simplified terms. They ploughed through a great range of themes and styles, they were heroic and they were unheroic, they were clean and they were dirty, they were optimistic and they were pessimistic, and they practically contained, albeit in a slightly watered down version, already most of the things which were later the basis for 70s westerns.
Yes, there are US westerns which are that simple like described by you, mostly serial westerns of the 30s and 40s with Roy Rogers and others, and there are surely also some 50s western of that kind, especially in the b-picture department, but the others which come to my mind first for that kind of western were mostly made in Europe in the first half of the 60s.