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Phone calls still assume the people on the receiving end are attached to a desk.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
I can see both points. In my experience, people misuse calls more often, since a work-related call would often require a follow-up email anyway, but that's more anecdotal evidence