If I have time to watch a 20min video it's because I'm at home doing nothing and home is where my TV and computers are. If the only thing I have is my phone that means I'm out doing something, so I don't have time to watch a 20min video.
Either that or you're commuting in a country with good signal coverage, for instance.
I live in a hilly region in Europe, so streaming while commuting is difficult because of tunnels, but it can be done.
Good thing I said """I""" don't see the reason to do it, as in this is my use case for me personally . For a second there I were dangerously far from saying "No one should ever"
Will i watch videos on my phone rather than my computer? no
will i watch videos on my phone rather than staring into the distance and feeling the state of the world slowly and agonizingly send me into a spiral of depression and anxiety?
Meh, I've got a 4k phone with Dolby atmos. I'm fine watching a movie on it. As a technophile and audiophile, it's hitting everything it needs to hit for me. I do prefer to watch in my VR headset overall, but VR headsets are still only up to the equivalent of 1080p at a comfortable field of view. Still pretty good, but the main upside for VR is perfect 3D, I'm one of the weirdos that likes 3D.
But, I do get that at the time of this recording, he had a 4-6 inch diagonal phone with a single tinny speaker and 576p screen in mind, and that would indeed not be a great way to watch a movie. Though if people like it, no real reason to be snobby to them about it, they just don't care about the same thing he does/we do.