Can anybody tell me what's the big deal here? Thanks to eSIM, there are so many international plans for travelers. And what's so hard putting a local SIM in to avoid roaming charges? With services like whatsapp and other messaging services, I don't see issues of missing contacts while roaming.
Also, if there's a healthy competition between the carriers, they will compete to offer roaming deals with their own partner carriers from various countries. Eg. prepaid plans in Singapore can roam in some countries using the same local data plans.