I think the changing phone holding etiquette is really interesting and there are lots of factors.
But I think the key reason is that for a lot of people, video calling is now the default in all scenarios, so the phone tends to be held in front of the face. But then the earpiece is too quiet, so of course they default to speaker.
I've asked a couple of people recently in cafes who were using video and speaker if they have headphones, and they seemed surprised and confused. (Edit: and in one case, very annoyed to be interrupted while in a work meeting, but then they were in a library). It's pretty normal now I guess.
I think the changing phone holding etiquette is really interesting and there are lots of factors.
But I think the key reason is that for a lot of people, video calling is now the default in all scenarios, so the phone tends to be held in front of the face. But then the earpiece is too quiet, so of course they default to speaker.
I've asked a couple of people recently in cafes who were using video and speaker if they have headphones, and they seemed surprised and confused. (Edit: and in one case, very annoyed to be interrupted while in a work meeting, but then they were in a library). It's pretty normal now I guess.