This is the weirdest product to complain about this for. For something so small, replaceable battery hardware would double the size of the thing from the battery connectors alone.
Yeah it just doesn't make sense to be upset at airpods here. The airpods are smaller than the AA batteries which are often just disposable after a single use.
But I'm pretty sure Samsung Buds (perhaps the first gen?) use some sort of standard battery.
I don't know much about the samsung buds, but I imagine you'd be pushing out all the nice hardware and features the air pods have from doing that.