It depends on what metrics you are basing the degradation. Financially they are doing very well. After they cracked down on account sharing, they gained six million new subs, so they seem to be doing well on product as well.
They don't seem to have as much breakout content as before, but I think they have a lot of minor hits, especially in other countries. And honestly that is better for their business than huge breakout hits.
From what I've heard from friends who are still there, the nexus of the company shifted from the Bay Area to Hollywood a few years ago. At that point they became more of an entertainment company than a tech company. Some have said all the "hard" problems are solved, now they are just making small adjustments. Although I disagree with this: they quietly added live streaming which was a huge tech leap for Netflix, although it was so quiet no one seems to have noticed.
Also, with the economy the way it is and being an entertainment company now, they are starting to worry more about budgets. When I was there the only real budget guidance we got was "don't grow your headcount faster than our subscriber count" and "keep IT costs flat on a per stream basis". I hear now directors get budgets they have to stick to.
Also they added leveling which allowed them to hire more junior engineers. When I was there, there were no levels. We didn't really hire junior engineers. We hired senior engineers to solve problems that usually juniors would be given, and they would solve it with automation and robustness that maybe took a bit longer and would be considered "over-engineered" but that lasted for years and scaled with minimal effort.
But the freedom is still there for the most part. Managers still mostly just provide context and the leaf nodes come up with the implementations.