When travelling how? By car you have a cable charger or wireless charger in 99% of cars I’ve been in
Planes have plugs Trains have plugs Ubers have plugs
It seems like that is a once in a while occurrence for you
In which case you’d be better off with a thin phone the vast majority of other days and pack a thin MagSafe charger for those once in a blue moon travel days and it would just be slightly thicker than a thick phone while the vast other days you’d have a thin phone