Am I the only one thinking this urge to optimize our time is just anxiety? I'd argue not spending time worried about time usage would make one use better its time.

I'm not referring to the article per se, but to this kind of articles in general.

On this article: why school is considered not discretionary time? Also commute and meals are somewhat discarded. While cooking, or helping, read a poem or a short story; while commuting, read a book, listed to some good music. This way, discretionary time becomes 100%.