Yes, I understand that.All countries with cell phone networks will support it, in other words, all countries. So if you have an eSIM and your home carrier allows roaming, you can use your phone on any other network regardless if that local carrier offers eSIM to their local subscribers.
Basically, a network doesn't really know if you have an eSIM or physical sim, all it sees is the credentials inside. Both sims work the same way, the only real difference is the one is embedded in a chip in your phone.
I meant which countries do they travel to that have carriers that don’t offer local prepaid eSIMs.