How many employees do you think have the stuff to capture and processes 4k video?
Considering digital content is their actual job, all of them?
Fuck me, even I can do it and it's not my job.
Also you can upload at a higher res because the bitrate at 1080p in 2020 is still dogshit on youtube.
But I wouldn't expect people who's jobs it is to do this, to know this; considering it's been thing for over a decade nearly.