I completely understand and sympathize with your point, however this:
"If you use a slightly niche OS (say, OpenBSD on ARM)"
Is rather hilarious - calling OpenBSD on ARM a 'slightly niche' OS in the context of 'operating systems people use to watch video on the web' is rather ambitious, don't you think? OpenBSD on ARM would have to increase it's user base in this arena by a couple orders of magnitude to elevate itself to 'slightly niche'....
"If you use a slightly niche OS (say, OpenBSD on ARM)"
Is rather hilarious - calling OpenBSD on ARM a 'slightly niche' OS in the context of 'operating systems people use to watch video on the web' is rather ambitious, don't you think? OpenBSD on ARM would have to increase it's user base in this arena by a couple orders of magnitude to elevate itself to 'slightly niche'....