I would assume carriers would flip out and drop eSIM support if it did something they don’t allow.Since this is opt in by networks, I look forward to EE not allowing it.
They still don’t let you transfer it through quick start. You have to either download an eSIM to your new phone or get another QR code card. And you need the old eSIM still active to get a text to activate the new one 🤔
It’s a right mess, this should be supported by default without carrier intervention