Not really true. I definitely failed to get one of these cards working with a provider. Some providers insist on only allowing device models they're familiar with, based on the IMEI/EID/etc.

And that's a major flaw of eSIM. Providers shouldn't even have been given that kind of discrimination capability.

With a physical SIM, I can pry my card out of one phone and put it into another, and expect it to work. With eSIM, every single eSIM has to be carrier approved and GSMA approved, and every single transfer from one eSIM to another has to be carrier approved too.