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Most eSIMs are not reusable; that's just standard, not a weird restriction.

I’ve used many that are reusable, so I’ll continue considering it a common but weird restriction.

Which operators? From your other comments I would think Vodafone (CallYa?) Germany - any others?

(I haven’t seen any other that ships reusable QR codes yet.)

Ok but then they just aren't usable like a normal SIM. And not a suitable replacement.