I tend to disagree, simplicity of a tool can have a direct impact on its usage.
Take a screwdriver as an example, versus a screw gun. Both serve the same purpose. The screw driver is a simpler tool, which makes it easier to use: no manual to read as long as you know what a screw is. The screw gun though is more powerful, but you MUST learn how to use it: how change change between screw/unscrew, check battery state, remove lock, change speed, etc...

In the above case, the simplicity of one tool in regard of the other is about what it can do, not how it is made.
This is the same for software. If a tool has no options to change it's behavior, it will be "simple", as in you won't struggle to use it. But the code of this soft can still be a total cluster fuck...

Software simplicity is hard if you ask me.