No one is saying it can’t be easy. It’s about control. Some carriers ask for $$ to swap eSIMs to another device. You need to ask for their permission first. This is basically like voluntary DRM.
This is less a problem with eSIM and more a problem with global corporate culture combined with a complete lack of effective regulation.
It doesn't actually have to be any different than a physical SIM in any way. You could just use a QR code in place of the SIM and it's the same thing (assuming the phone has a working camera, which is another interesting aspect.) Doesn't even have to be a QR code.
I too do not like the removal of the SIM slot for all the reasons mentioned, but there's nothing stopping the network operators charging you for another SIM card.
There is a way this could be an improvement and work the same except for having to fiddle with the tray. The fact that it's not is a regulatory failure.