It would be super convenient, given it's size, for me to purchase a eSim card abroad with unlimited data and not having to drain my phone battery.

This is a travel router.

This is a travel router without a modem. It would be super inconvenient if you bought an eSIM for a device that does not have a modem. You might as well by an eSIM for your toothbrush when you are traveling abroad, it would equally "convenient."