kadu

But full bitrate 4k from a Blu-ray IS better.

Full Blu-Ray quality 1080p sources will look significantly better than Netflix 4K.

Hence why “4K” doesn’t actually matter unless your panel is gigantic or you’re sitting very close to it. Resolution is a very small part of our perceived notion of quality.

It’s the screen size that makes a difference

Not by itself, the distance is extremely relevant. And at the distance a normal person sits away from a large screen, you need to get very large for 4k to matter, let alone 8k.