An interesting read at the linked article below. Whilst it is a given that eSIMs (and their successor) are going to happen, there are clearly some rough edges that need to be worked on. What was going to be greater freedom to switch SIMs, could end up being a bit of a lock-in with an existing eSIM ;-)
I've switched more than once between an iPhone and an Android phone, and even moved a SIM card from a mobile hotspot into a second SIM slot on an Android phone. And yes, some of these things may not be easily possible yet with eSIMs. As the author pointed out, they ended up with two phones and no cellular service at all.
See
Using eSIM to switch between phones isn’t exactly easy right now#
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mobile Switching from iOS to Android with eSIM gets a little hairy.