Are you honestly saying you have never discovered something new about a simple tool by reading a tutorial or watching a colleague? If you are fully able to understand the usage and implications of every simple Unix tool based solely on the man page then you are far smarter than not only me but every person I've ever worked with.

ssh is not a simple tool, it just started out as a simple tool. And, it occupies a key role, for better or for worse, as the base layer for secure communications in a unix environment (and beyond).

Combine those two facts, and it's not surprising how many articles there are explaining the ins and outs of ssh.

I've been poring over unix man pages for about 25 years, and we all know their terseness is a delight and a frustration. ("Sharp and newline surround comments." -- takes a minute to parse.) These articles are trying to add words to address the frustration part.