Someone like Frank Hackley could better answer this but, I think it was some of both. Their goal was to manufacture the best ammunition possible for the National Matches and other competition, but they also realized that civilian shooters in particular would use the empty cases to load their own. Decisions such as omitting the primer crimp were made to facilitate reloading the cases and had nothing to do with accuracy. But, I believe the number one goal was the best and most accurate ammunition possible.
You have to remember, when Frankford Arsenal re-started the production of Match ammunition in 1956, they had not regularly produced match ammunition for almost 15 years. Most of the old employess with the detailed knowledge of match production had retired and the new employees learned as they went. Everything considered, the quality of the ammunition produced from the beginning was outstanding.
Some of the old Ordnance officers such as Hatcher and Whelen were as much shooters as they were Army and you can see their influence in a lot of what was produced at Frankford. It would be hard for me to believe that they didn’t have their finger in the pie.
I’m not aware of empty cases being produced in 1957 but I know that they were available as early as 1958. Match bullets were available as early as 1957. Even though production of M72 stopped in 1968, both new empty cases and bullets were available through the old DCM for many years after. A lot of them are still found on the various auction sites. I think you still list them from time to time. Here’s a photo of both from my collection.