OK - so I'll share my thoughts, after having watched the video (nice video, really liked how you explained it).
Now I've been a content creator since 2007 (gaming channel) - seen the evolution of YouTube and the effects HD had on all videos.
Then about a year ago or so 4K got introduced and most of the "big gun" YouTubers, such as MKBHD and so on started adopting 4K in their videos, however still utilised 30FPS footage.
I never saw the honest benefits of 4K - for several reasons:
1. Load times - I have a very "fast" (80 down, 20 up) internet connection, but have a worldwide audience, which might not also share that fast connection. Furthermore, might not be bothered to wait for it to load
2. Devices - an increasing amount of viewers are coming from mobile - I myself watch YouTube every day on my commute to work. On mobile the max resolution is 1440p/1080p
3. Noticeable difference in bitrate/quality - sure there's a difference but you really have to be observant tot see the difference between 4K and 1440p/1080p on a 1440/1080p screen
4. Despite the bitrate increasing, it doesn't stop the fact that most people are still on 1080p screens and/or adopting to 1440p - the 4K market has not really taken off
So, then when I went to buy a camera - not only did I want a compact camera, but I wanted something that could record 1080p but at 60 FPS - I couldn't careless for anything above 1080p, as the market hasn't really shifted above it yet.
I am typing this from my QNIX QX2710 - which when you go 1440p you never go back. 4K is a whole different thing - sure it's beautiful, but when it comes to games and/or cost to performance, 4K is simply not really that worth it.
In conclusion - I wish I saw more people using 60 fps recordings it absolutely revolutionises watching experiences. I cannot myself ever upload something in non-60+fps any more. When I watch a 30fps video it feels old - be it at 4K or 240p - however when I watch a 60fps recording, even if it's just to show a product, rather than a game, it really changes the dynamic of the video. I just wish more people noticed it and bigger YouTubers actually realise this too - I just cannot see the benefits of uploading iun 4K when most of the market is still watching in 1080p