For the last 25 years or so, the world of digital video has been obsessed with increasing resolution. 'HD' (1280 x 720 pixels) and 'Full HD' (1920 x 1080) were the resolutions of choice from the early-mid 2000s, and a decade later 4K (3840 x 2160, or 4x the number of pixels in Full HD) became the resolution we had to have, whether that be from our TVs and computer monitors, or when shooting video with our cameras.
Even in the mid 2010s when 4K was ramping up in popularity I questioned its real-world benefit. The jump from analog VHS video to standard-def digital DVD content (480/576 horizontal lines) was night and day in terms of image quality, while the leap from DVD res to Full HD was almost as pronounced. The difference between Full HD and 4K was far less noticeable, although it was at least a subtle improvement for most people viewing big-screen TVs at typical viewing distances.
