I just don't see what problem eSIM solves aside from the "must be thinner/more seamless" non-problem.

I suppose there might be some corner-cases-- super-travelers, spammers, certain types of devs and network engineers, where being able to have a thick stack of emulated SIM cards and toggling between them would be valuable, but I'm pretty sure they sold devices to do that with physical cards back in the day.

What I do see is a bunch of interesting new failure modes, and the ability for the carrier to get in between me and changing devices. They're going to want to turn "Put in the little pin and pop out the card" into something that involves paying $30 for the generation of a QR code.