4k and 8k is going to be more useful with large and extremely large screen sizes. HD is perfectly designed for traditional TV use cases - with a screen on a table in a living room.
4k and 8k means a completely different use model, like a giant wall-sized screen in the same living room. It's the difference between a movie theatre and an IMAX movie theatre.
When that happens, cinematography can expect to be different, sorta like IMAX movies have different cinematography. Sometimes they even composite multiple HD films together on screen without losing resolution. This would actually be extremely useful for sports, where the background shows the entire field at 8k, with windows showing stats or replays, etc..
4k and 8k means a completely different use model, like a giant wall-sized screen in the same living room. It's the difference between a movie theatre and an IMAX movie theatre.
When that happens, cinematography can expect to be different, sorta like IMAX movies have different cinematography. Sometimes they even composite multiple HD films together on screen without losing resolution. This would actually be extremely useful for sports, where the background shows the entire field at 8k, with windows showing stats or replays, etc..