Crop mode digital gives us more options than we had in film days. Obvious statement, sorry
To explain, I can take my GR and it has 28mm native, and 35 and 47mm using the crop setting.
Additionally I could take an A7 with a Loxia 35mm and use it in APS-C mode to get 50mm. Or take a A6000 body with the Loxia 35mm to gain 50mm.
One lens, two cameras = two focal lengths.
A spare camera might be wise on Guy's trip. You don't want to have one break and nothing to show when you return.
Of course you could just crop in post. Not quite the same though when you are framing up ready to take a pic.