I love e-sims for travel and easy switching, but I also switched my primary number back from an e-sim to a physical sim after I realised what a pain it is to use it in another phone (my provider requires a fresh QR code sent by post to my registered address in order to do the switch - huge pain when my phone went in for repairs so I had to switch twice within two weeks, switching to a secondary phone, and then back to normal phone once it was repaired).