earbuds fall out all the time for me because generic earbuds are not shaped to fit everyone. it happens most often when i'm walking.
Why didn't Apple allow for custom earbuds e.g. Comply or provide some way to modify the physical design to accomodate people with different ears.
It's not a hipster 'artisinal' thing as much as they ostensibly work better, and they aren't "hand carved"... there are refined process for this.
But they are supposed to be much more comfortable and sound better. I can't comment becasue I don't play enough (or make enough playing) to justify spending $500-800 on them.
And I believe (but am not sure) that there are existing bluetooth solutions, though I couldn't imagine using those in a professional music monitoring context.
So I can easily imagine that there will be custom refitting of these devices. However, custom molds often cost $200-300 (or more) by themselves, plus the drivers, so not in my proce range.
I do use my "cheap" (Shure se215 ~$100) wired IEMs with my iphone now when I want more isolation than open-backed earbuds like ones that came with my phone. They are great for mowing the lawn.
But maybe the airpods are more reliant on the ambient sound, so I dunno if there is much to gain from custom molds.
Physics?