Many do not take into account that not all films:When viewing a 4K BluRay I notice a slight difference compared to an HD picture but most people would not notice any. I stopped saving things in 4K because the huge file sizes aren't worth the small picture improvement in unless storage was much cheaper. Someday that may change.
1. Is everything done in a 4k studio master, including intermediate stages.
2. For most films, even if the master is made in 4k (if indicated on imdb), the shooting is done on cameras with insufficient resolution. To get a real 4k result in the studio master, taking into account post-processes and special effects (which also requires huge capacities), shooting should be done on digital cameras with at least 6k resolution and at least 4:2:2. 8k is better. And effects too. A 6k/8k optics is very expensive. And not all projects can afford it.
And do not forget the main thing - all studio masters, even made in 4:4:4 4k and 36-bit color with a huge bitrate, you get on BD/Netflix always in 4:2:0 at best with HDR. And only copies for cinemas most often come with a bitrate of 250-500Mbps in 36-bit color and only 4:2:2 as maximum. Those, real 4k with 4:4:4 is physically inaccessible to you. So, in the best case, even with a reference studio master, you get about real 3k at home screen...
For example, to make it clear to everyone, I can give the final part of the Marvel crafts about the Avengers. There is a small stage where nature is shown on the planet of Thanos. I am always interested in such crafts from a technological point of view, as a milestone. So that's all they were able to calculate in 1-2 years of work - an insignificant piece of what was done on level for the full-length Avatar(completely naive and childish film of the level of teenagers according to the script) of 2009 (which was also full of unfinished scenes due to lack of resources, which is clearly visible to professionals). Despite their huge budget (Marvel), the actual level of special effects is just embarrassing for 2018-2019. Apparently all the money went to pay the actors. Today, in order to really surprise the audience, even taking into account modern special effects, the budget of the picture, minus actor's fees, should already be close to $1-1.5 billion. And who will go for this? After all, the goal is to collect a quick cash register. Not to mention the shameful quality of Hollywood (and not only) scripts in 99% of films. That is why cinema is the lot of naive youth and it is on them that all calculations and box office receipts are built.
Then older you get, then more boring and naive the movies become. Books are the only thing that can save, but and there is a lot of garbage. And books are mostly useful for development in youth. That's when they need to read a lot and voraciously. But who would only suggest to a young man the most important, like milestones, works?