I think it has to do with lack of tasks and work needed to be done on vacation. Your point is to interact with the environment in a way that is enjoyable and you don't need supplies for that. But getting through a work or regular weekday day requires supplies unless you are a lady who lunches. There's no time crunch on vacation so if you can't do thing a) because you don't have supply b), you just rework your schedule to do it later when you have the thing. But trying to be productive for non pleasure has a less forgiving time table that would really irritate you if your day got thrown because no pen, no menstrual product, no notebook or laptop, or whatever thing you needed to continue to be productive.
