Earlier quoted context omitted.
A lot of people watch TV/movies at night with headphones instead of speakers, in order not to wake up the kids, grandparents, someone who works early, etc. Especially when you want to fully experience those big loud action sequences without making the house actually rumble. This is for people when they aren't using their speakers at all. Edit in response to your edit: I think you may be misunderstanding Apple's spati…
It’s still post processing to create a sound stage to a stereo signal. Nothing wrong with that, but for instance if I’m watching a movie on an iPhone or something, I’m assuming I can’t get the true audio experience of the film. When it’s a movie I really am into, then I’m going to watch it in full surround, with discreet speakers. 7.1 to stereo headphones is always a compromise whether it’s Apple spatial audio, or Do…
Your ears are a 'stereo signal' and they work fine for recognizing the sound stage coming out of a 7.1 system. The Airpods are just presenting the same audio information directly to your ears.
Besides, there is a massive difference between Dolby for headphones and spatial audio - standard surround headphones will not give you a fixed sound stage as you move your head. I think you're underestimating the effect, if you haven't tried them.