I have a Dolby Vision/HDR TV that normally shows dark very well. Not the case here. I don't pay HBO to squint at a black screen.

Like to see a test with the new Canon R7 which supports 4K 60 at 10bit with Canon Clog.

The proper term for those criticizing and offering a "fix" is dilettante. Not worth listening to.

What's the difference between TV-MA and NC-17?

These options have been around for some time. They are getting stiff competition from BMD and Da Vinci Resolve so they are trying to counter them. They haven't upgraded their built-in audio tools, once cutting edge for video editing, for years. I wish they would bring back and upgrade their affordable Blu-Ray/DVD authoring tools, and offer 4K as well. There is still a need for them. Competitor offerings are very expensive.

The rings came into existence long before the time of the trilogy. That's actually in the books.