Informational diagrams … should take more time to look at than to create?
This could be argued to be true for works of art, … but surely not for diagrams used as information transmission tools! I think the opposite is the goal in this context (modulo time cost of diagram-maker(s) vs time cost of diagram-viewers).
Diagrams like this are a Drawn Once* Viewed Many medium, and as such every extra (single) minute spent improving the quality of the diagram leads to a reduction in the time spent by _each_ recipient. And each piece of information clearly expressed there reduces by [the number of people who need it] the amount of dialogue required before clarity and “same sheet” understanding is reached.
[* OK, they may well be revised and so on, but most often number of makers << number of viewers]
Not complaining about the article here, just about the appropriateness of the quote (unless meant ironically!), and <rant>the mentality of an increasing number of people, who seem to spew “information” without ever taking in, acting on, or reacting to, any data or questions that are sent to them.</rant>
Glad I got that off my chest.
p.s. I'm not locked to the “take a long time to make it so it's trivial to understand” view, but in general those in a position to be making the diagrams /should/ have the capability to make good ones that may be understood by more junior people (or those from a different field), and so not to do that smacks of laziness or arrogance (or, being generous, a genuine failure to realise the level of expression required to achieve understanding by the target audience).