I recently bought a device through my carrier (secondary device, secondary carrier; luckily not my primary device) to replace my existing one. Old device was still physical SIM new device only eSIM. I paid for it in a store, but it had to be shipped because they don’t have it in stock, even though it was in stock on their website (including after I left). It arrived late, the day before I was set to travel. The rep said I could just turn it on and follow the prompts and it would auto activated. It didn’t. Luckily it didn’t deactivate the old SIM. At least it didn’t until I called tech support and got their help. They said hang up, restart both devices, and the new one should work. Of course it didn’t work and both devices were now unusable. Had to go into a store and have them sort it out there.

On the flip side, being able to have a primary I never change and a secondary that I swap out for international travel has proven to be extremely valuable to me. So you take the bad with the good.