Change and innovation don't happen everywhere all at once. Everett Rogers wrote a famous book on how innovations spread among agricultural professionals, and it since became required reading in many other fields.

Note that slow adoption of innovations isn't always a bad thing. For example, when the authorities recommended stopping routine PSA screening in 2012, many doctors didn't listen and kept doing it anyway, and many people here in the forum benefited from the earlier detection — that's a case where the late majority/laggards were right. But it is unfortunate that so many new, proven treatments for prostate cancer still aren't familiar to practitioners in smaller centres and hospitals yet.

(Personally, I want my treatments to be right on the line between Early Adopters and Early Majority on the Rogers curve; to the left of that, the risks of unproven treatments outweigh the potential benefits; to the right of that, I'd be missing out on treatments that would have a strong probability of helping me.)