While in the present, SIM is definitely easier for travel, when I traveled internationally recently, it was pretty easy to just purchase an eSIM from places like Airalo. eSIM is definitely not at abundance that SIM is (much like going from micro USB to USB c or any similar transition), I think it’ll get there. iPhone 14 series eSIM convenience is an early adopter burden type of thing imo, sort of like when headphone jack was gone. But it’ll get better.