Apple basically forced US carriers to get their act together when they shipped the iPhone 14 series as eSIM-only domestically. Sounds like the rest of the world is about to get kicked into gear.
The major carriers perhaps, but support among the MVNOs isn't universal. Number sharing support for smart watch usage is almost non-existent among the MVNOs in Australia.
Eg. ALDI (yes, the German supermarket chain run a MVNO in Australia), have been saying esim support in the future since 2021.