eSIMs are paired with the device they're registered/installed onto. They are not transferrable to any other device.
This does improve security. A thief cannot steal your SIM and use it in their phone to bypass your phone's security features. A hacker cannot use your SIMID without also having physical access to your specific device/hardware.
But I think the way the industry markets eSIMs is anti-consumer. eSIMs do indeed increase security for providers (since they permanently pair a SIM, an IMSI, an account, and a device together) even though they do not increase security for consumers (they are basically a vendor-lock, a trap, and an inconvenience for the vast majority of subscribers). eSIMs are advertised and positioned as commodity items, the preferred choice, the better alternative and you'll see people here every day who believe(d) that eSIMs are better than SIM cards even though they can't actually tell you why, aside from noting that the marketing implies that eSIMs are somehow better.
I don't fault people (like the OP) who make this mistake because they're being blindered and blundered into it. I do blame the providers (and their retail staff) for deliberately keeping and deliberately creating this consumer ignorance.
