Everyone is welcome to their opinion, but I disagree with yours in regard to major studios not being able to churn out good products. Today, I watched both, Cool Hand Luke and The Maltese Falcon on 4K/UHD from Warner Home Video, and they sounded and looked outstanding on my HT systems.
IMO, I think it was just poor workmanship with the Rocky boxset and has nothing to do with budget. You can tighten up your PQ without spending more money.