I have a Google Pixel with my home country SIM in the slot and I only travel with eSIMs. Almost every country offers eSIMs but they are usually more expansive than the same data with a physical SIM. However I am willing to pay a bit more for convenience and if ever I need a physical SIM, I have a second phone so I do not need to remove the one from my Phone.
Have been in many countries in SEA, Vietnam and Thailand included and both of them have good eSIMs, especially Thailand.