The main issue behind all this for me was, how this one done without DME, and to be more precise how the vertical profile of the approach was flown back then and in which configuration.
Dive and Drive or, as another poster put it, Chop and Drop.
My company did teach to start rounding out the descent 100 feet above MDA.
The potential for disaster in an airplane like the 727 was not insignificant, thus the referenced Reno procedure was seldom used. The FAA had a very agressive program to install ILS IAPs at all major or semi-major (aka Reno) in the late 1960s into the early 1970s.