eSIMs are nice in that you can install an app and it can activity service immediately. You don't have to go to a store or wait for a physical SIM to be mailed to you.

Also nice for people who frequent different countries, easier to switch by tapping a button in the phone than having to replace the physical SIM card each time. And no more forgetting the right SIM or not having a tiny thing to get the SIM card out in the first place (or having to borrow someone's earring).