When you are doing all those things isn’t your phone in your pocket and therefore not draining battery?

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

"I'm accustomed to being glued to a plug so everyone else on the planet should be too".

No, thanks, I have up to 5 days of the runtime, I don't need a paperthin phone which I need to babysit.