This is the most ridiculous thing about Netflix. So many great brains there yet none of them can perceive a world where not everyone has a high end home cinema.
I also have a hard time believing Netflix would be ok putting up money to capture a picture/series all in 16mm film (or that anyone would suggest the commercial success or artistic vision demanded it).
So it doesn't stifle creativity, it future proofs Netfix for the lucrative high end market, AND Netflix is paying (at least indirectly) for that level of quality. I don't see the problem here.
The problem is that the camera requirements are defined, presumably to try to have some lower bound on the quality of the visuals, there is no requirement for audio such that it sounds good on stereo speakers, which is probably what the majority of consumers are using.
The idea that Netflix have such a strict definition on camera quality is also a bit of a farce, given how woeful the image looks after it goes through their incredibly overenthusiastic level of compression, but that's neither here nor there.
Compare to Disney+. As much as I dislike Disney, they have 4K Dolby vision for no extra cost, and quality is excellent. Prime and Netflix could both take examples out of their book. (Some of the compression in recent Amazon shows has also been very bad. For example, the trees in the background of the wheel of time were often a mess of compression artifacts even at 4K.)