Idk what you're experience with esim and switching phones is but Google Fi does it pretty much instantly for me. I've switched back and forth between my s21 and pixel 7 multiple times and never had an issue.
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.
I had heard about that! Kinda nuts that America seems to just be universally doing the wrong thing about everything. We can't have nice things here, ever bc the worst people just want things to be worse.