One Patton tanker I knew hated that stereo rangefinder, needed constant adjustment.
Until lasers come into play, probably the UK's way of using machine guns for ranging was superior for an actual shooting war.
The Isralis found that with the ammunition/gun combinations they used from 1970 the ellipse or ordinate made by the projectile out to 1,200 meters was not enough to justify using the range finder. In situations where seconds counted for achieving first shot/hits they gunners were trained to focus on correct deflection and get rounds down range. They felt the proportion of first hits were higher with this method. They did use ranging fire with a MG where time allowed & at 1,200 meters they would start using the rangefinder, or would use it where time allowed, or where the ammunition used had a more pronounced ellipse & 'drop' from 500 to 1,000 meters significant.
A US tanker who served between 1958 & 1967 told me they had endless trouble with the range finders, until a manufactors team taught them the correct methods for setting, adjusting, and using the RF. When that occured he realized the tank school at Ft Know was badly off in its instruction. He told me the NCOs who returned to Knox for the advanced gunnery course were scolded for doing it wrong and had to learn the "fucked up way" as Ron put it, to pass the course.
The methods and equipment we used in the artillery were different than the tanks & our range finding was at ranges beyond what tanks used. Even on small National Guard camp impact areas I seldom observed a range to target of less than 3,000 meters & 5,000+ was common. In the Mojave Desert observing a target at 10,000 meters range was not uncommon & occasionally we were shooting at ranges beyond 20,000 meters. it was a very different game.