While I could definitely see the attraction (And would want them myself), it would mean extra processing power, and storage for the data, as videos are larger than pictures and gifs. A lot of lower-end computers would suffer rendering those in addition to the game. Until Subnautica is well-optimized for smooth gameplay on lower-end computers, I don't think such a feature is viable. :c
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dont have anything in mind right now but probably a looping video, like from here https://www.reddit.com/r/Cinemagraphs/