The viewing angle isn't the ultimate determining factor
Not ultimate, but it is one of the main factors.
it's uncommon for people to sit within 4 feet of a 65" screen
Their loss. That is also a bit of an exaggeration. I sit 5-6ft from a 55" screen which I find ideal.
If you aren't situated in the furthest rows of a large theater, the scale perception at a cinema is likely to be more impactful.
That's a perspective thing, you unconsciously compare the size of the faces/heads on-screen with the silhouettes of the heads of the people in the front row. You can't really recreate this at home, but once you're consciously aware of the effect you don't miss it as much IMHO. That might just be me though, I fully accept that.
I'd question how many people are investing thousands in subwoofers solely to surpass cinema-level sub-bass frequency at home.
As a fraction of the populace? A tiny fraction of course, but still many thousands of people (tbf this is a much bigger thing in the US, not so much in the UK). Most people have never heard low distortion 10-20Hz reproduced correctly at 110+dB, much less used to good effect in a movie (more movies than you might think have deliberate effects at these frequencies). I think a lot more people would want it once they had experienced it first hand.
It's worth mentioning that frequency is only one element to consider when handling sub-bass.
Very true but that's getting off topic for this thread IMHO, let's just leave it at 'sub-bass done correctly' shall we?
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