Similarly for a lot of these tough-guy manager stories, they aren't doing anything that requires deep thinking like debugging TCP stacks.
You can have non-negotiable meetings and shift things around all you want if you have that kind of authority. But a lot of every day folks don't have the kind of work autonomy to have their schedule match their preferences
It's unfair to compare the average Joe to the POTUS. The POTUS has an army of aides to help him in his duties and he is expected to maintain good health.
A better way to approach the problem is to help people identify where there is a waste of time happening and guiding them to reduce that.
Personally I feel that smartphones have robbed us of our free time. They have seriously reduced our attention spans, have been feeding us endless information, most of which is useless and have made us borderline addicts. To maintain a healthier lifestyle and find more time per day, I would seriously consider ditching the smartphone and make do with a feature phone.