The key word here is “typically”.
replyTransferring eSIM from one iPhone to another can be restricted by the carrier. Here in India, the second largest carrier (Airtel), does not support the native iOS eSIM transfer process. It’s a separate set of steps (the ones published on Airtel’s website won’t work, despite customer care claiming that it does). What works is almost like applying for a new or replacement eSIM.
Same here, KPN, NL. You have to install the KPN app on the new phone and log in. Then you request an eSIM on the new phone. You get an SMS auth code on the old phone. You fill the auth code on the new phone. Then you have to remove the eSIM from the old phone (with the new one not provisioned yet). Then confirm on the new phone and cross your fingers that provisioning works. Presumably (according to the docs) when it fails, you can reprovision the old phone again.
replyThe process made me so anxious the last few times, that I went to the carrier shop and asked for a nano SIM. Now life is bliss again.
It seems that eSIM is primarily an advantage when you need to get a new SIM, but other than that I don't really see much of an advantage for me as a customer.