You still get to use it as normal, so long as you have service. That said, I personal stick to physical SIM just to minimize any problems, but you do you.
I've never used an eSIM but have used and liked having dual physical SIM's.
But I've also lost a phone now (first time for everything 😡) and can kinda see the bonus of eSIM's in that regard instead of having to wait a couple of days for a replacement.
So even flashing a new ROM on the device won't erase the eSIM right ?
Even if it does, you just set it back up again the same way you did the first time.
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