You stop asking “Will I ever watch this?” and start asking “Might someone I know want to watch this someday?” The drive becomes a social artifact, a lending library, a time capsule.
If you're looking for information on movies available in high resolutions like 8K or even content that could be considered to "fit" a 9K display (noting that 9K content is extremely rare), here are some points: 9k movies fit
The user interface is usually cluttered and confusing. Buttons are often disguised as ads, and the video player may buffer frequently or crash. The "quality" promised in the title does not always match the actual file, which can sometimes be a "cam rip" (a low-quality recording made inside a cinema theater). You stop asking “Will I ever watch this