That was the golden age of vinyl. High quality hifi sound was a new thing then that sold and all the record companies marketed their own brand of cutting edge sound. RCA was a big name back then!
That was a special time. These days most people pay little attention to sound quality. That alone will sell little. People could care less. That’s ok. It is what it is. Those who do care can feast on more great recordings than ever and more produced every day. The times they are always a changing.