My preference would be square screens everywhere, but the growing consensus does make sense, which is that the kind of videos you look at in a scrolling view should be in portrait format, while sit-back videos like TV and movies should be in a wide aspect ratio.
Off the top of my head I’m not sure if (say) Instagram even has a desktop version –certainly no one uses it – so posting landscape videos there would be objectively perverse, like eating a filet o’ fish with a fish knife and fork.
