I've been wanting to ask similar question.
On el-cheapo phone it used to be the case, could go back and forth, between 'upright' and widescreen sideways (using a tripod stand).
Now, many 'widescreen' attempts are met with blank screen, but some title msg, like "Press xx and drag for xx". Or, barely touch the 'widescreen' and it shrinks to 1/4 size, there. You cannot touch the bottom progress bar, (to go back couple minutes), or same thing; it goes from full screen, to 1/4 occupied.
That's not EEVBLOG, it's YouTube on any video. Might be Android user interface. Gawd, I wish we had more 'genuine' market stuff.
I'm trying to study, about 'Anti-trust' dynamics, monopoly markets just 'Kiss the Green Butt from Hell', as my late-friend Jeffy would say...