I'd say you're missing out without mods personally. There are some absolutely fantastic ones out there that do everything from adding features that should have been in the game from launch, like the Evac all button, Wizard Hats to new game modes all together. My personal favorite is Wave Com that changes the game to be a pseudo-wave defence game with RPG elements to it.
XCOM 2 is a seriously customisable game and you're missing out if you don't tweak things to your liking. Should they ever add in mods for the XB1 version I'd urge you to recondsider, if you're going to break your rule about mods XCOM2 is the game for it.