I have been searching but I haven't found but the opposite: idioms like
the KISS principle: Keep It -
- Simple, Stupid
- Simple, Silly (for children)
- Short and Simple
- Sweet and Simple
Keep the Simple Things Simple and the Complicated Things Possible
"Everything should be made as simple as possible, but no simpler." - A. Einstein
But not the other way round.
I'm curious about it, so I'll be waiting for the NES to answer.