The simplification movement has given us advice like this:
The Problem
E-mail takes too long to respond to, resulting in continuous inbox overflow for those who receive a lot of it.
The Solution
Treat all email responses like SMS text messages, using a set number of letters per response. Since it’s too hard to count letters, we count sentences instead.
two.sentenc.es is a personal policy that all email responses regardless of recipient or subject will be two sentences or less. It’s that simple.
That’s potentially great. It’s also potentially disastrous. English, like most languages, requires nuance. If your email message is regarding something more elaborate than, say, “Good. See you there,” it’s not done well in two sentences. Moreover, writing well while writing short is difficult — in many cases, it would take you more time to answer shorter.
I also can’t help pointing out that this bit of communications advice commits an error: They mean to say “two sentences or fewer,” not “less.” If you’re going to be brief, at least be right.