A common form of complexity is the sophistication of fear.
Long words when short ones will do. Fancy clothes to keep the riffraff out and to give us a costume to hide behind. Most of all, the sneer of, "you don't understand" or, "you don't know the people I know…"
"It's complicated," we say, even when it isn't.
We invent these facades because they provide safety. Safety from the unknown, from being questioned, from being called out as a fraud. These facades lead to bad writing, lousy communication and a refuge from the things we fear.
I'm more interested in the sophistication required to deliver the truth.
These take fearlessness. This is, "here it is, I made this, I know you can understand it, does it work for you?"
Our work doesn't have to be obtuse to be important or brave.