I don't understand how this wasn't more of a priority to begin with. If you're going to offer a digital solution for something it should at least be as convenient as the existing physical solution.
I tried to transfer my eSIM from my old S21 to my new S24 the other day. It failed miserably. My carrier charges me $10 for a new eSIM (which i think is way too much for a digital service). Transferring eSIMs sounds like a good idea if it works, but might not be endorsed by carriers that earn large profits from the service.