In many cases, CTOs for production companies understand and agree on the futility of DRM. Contracts with the actors and the production crew, however, are what require that the distribution be controlled in some manner. Specifically, things like royalties for distribution become difficult to calculate when there is no DRM involved.
The technical folks in the industry -- even the ones who make the decisions -- don't particularly want DRM but are often contractually bound to deliver it. Perhaps years down the line, a better model for cast/crew compensation will present itself and these agreements will slowly start to reform themselves.