I feel like a broken record at this point. So allow me to quote… myself

Not every phone I have supports esim. If my phone breaks for some reason, or something software wise happens to it and I don’t have the time to deal with it at the moment. I can pop out my sim card and put it into another phone to get it working so I have something at the moment rather than nothing. The example I’ve provided has actually happened to me before and I’d be screwed if I had an eSIM instead.