I disagree - it's clearly what consumers want. There are a million phone options, including ones with replaceable batteries, and overwhelmingly people choose the smaller form factor with nonreplaceable batteries.
I haven't seen a flagship phone with replaceable battery in forever. I absolutely want that and would pay more for it, but I won't compromise on performance and camera quality either.
But Airpods I don't care about the battery being replaceable. Maybe because I expect to have to replace the pods before the battery is useless.