Why black bars in 2020 ?

[dueda]

I've seem movies in 2.5:1 up to 3.5:1 ratio, great FoV and awesome with a really big screen.

But while cinema and TV both started as small squared frames, evolution on TV seems to be very slow and painful.
TVs went from 4:3 to 16:9 (4x4V : 3x3H), still narrow compared to 21:9 or 32:9 which are like cinema proportions.

1920:1080 HD (16:9) keeps the 4:3 TV ratio and was less disruptive and expensive to the business, bla bla... 
But it didn't solve the issue of watching very wide formats on a not-so-wide screen.

3840:2160 4K (16:9) just doubled the size (both vertical and horizontal), effectively quadrupling the area. Thus the name should be 4X, but it's 4K. Double again to 8K, but nobody is using that yet.

2560:1080 (1280:540, or 5120:2160) (about 21:9) seems to be the trend, a compromise between 16:9 and 31:9.
So we have, for comparison:

1920:1080 FHD 16:9
2160:1080 -2K- 16:9
2560:1080 ???? 21:9 *(approximate rounded values)
3840:1080 ???? 31:9 *(same)
3840:2160 -4K- 16:9

My point being: Now we buy ultra-wide monitors, or watch every program with black bars on top/bottom.
It sounds like the industry takes small steps to keep us buying new stuff each decade or so.

[[Auntie -BeeB]]

"It sounds like the industry takes small steps to keep us buying new stuff each decade or so" that's what they do,
I read somewhere that 99% of the new features on the current iphone have been around for years, they just drip the changes out, brand loyalty makes sure they sale.
BTW some of the things promised never arrive think, of DVD's and the promise of multi angle scenes, what happened to 3D TV?
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[dueda]

I agree, multi-angle or even 360 scenes would be great, even more with 3D; sports like football games did have some of that, but it requires a lot of computing power to render on the fly, not sure if smartphones and home PCs can do it. But 3D TV, there was two main issues: Eyeglasses and headache/sickness. If I remember it right, very few models didn't cause much sickness, but only a couple rare ones operated without glasses. So it wasn't the industry, just the consumers didn't like the product limitations.

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Also, professional aircraft simulators face the same sickness problem: The lack of physical movement makes pilots feel bad, incorrectly evaluate speed and course, and react with error; the specialists concluded the movement was part of our brain navigating system and now 3D or 6D freedom is common in most commercial and military training simulators; without it, training would be inadequate. I guess that would apply to 3D movies too, making the setup too expensive.