eSIM itself does not bother me, I'll adapt. But the idea of no SIM slot makes me a bit leery. I did 16 years with Sprint and SIM cards only became a thing with Sprint around 2011-2012. And Sprint was not unlocking them until 2015.
So for years there were phones that were locked to Sprint that were either very difficult or impossible to get unlocked. As
@Lounge vibes 05 mentions, the CDMA iPhone 4 had no SIM. It had an internal network chip that was locked to Sprint. There was no possible way ever to get that phone unlocked and even if you could, with no SIM slot where would you put a SIM?
So that's my concern and what makes me leery. Because of my Sprint experience, a device with no SIM slot indicates to me a locked device that you cannot/will not ever get unlocked. I know eSIM is a different thing, but who's to say we won't soon be encountering threads with users having problems because somehow they can't get an eSIM device unlocked?
I just don't care for the potential for some entity to be able to reach out and lock you down. I don't know much about eSIM (yet) so maybe my fear is unwarranted. But right now it just sets off alarms in my head.