@dovidBT
In those days there was a general lack of demand for Glatt by the typical EuroTraditional customer and the shul rabbis who supervised the butchers and caterers did not require Glatt. Many ate stam kosher in their own homes and shuls. The populace was not willing to pay higher prices that Glatt demanded.
My late parents didn’t buy glatt meat until they retired to Florida and it was all their local butcher sold. Mrs. CTL and I made a decision to have a glatt home because we anted all our friends and relatives to be able to eat here, not because we held by the chumrah of glatt.