Bureaucracy is always resistant to change, and the operators are the ones who have to force it. But these approaches do require full autopilots,
AFAIK, and those cost money to acquire and maintain. It seems there just isn't enough profit to be gained from operating at those conditions to justify paying for the additional equipment, at least in the opinion of the operators. If there were obvious profit to be made, they would be clamoring for the approaches. They aren't. And they aren't putting flight directors in helicopters, either. Some are taking out even the Phase 3 provisions from their S76s, because they don't want to maintain them, and don't want the pilots to become lazy by relying on electronics to do their jobs.
It continues to amaze me how idiots get to be in control of companies.