For a universal, objective idea of simplicity refer to Technical Simplicity.
However, when we use the word simple we often mean in terms of how the given thing appears or how humans interface with it. This is what I call Interfacial Simplicity.
The two ideas are not mutally exclusive, but it is definitely possible for a something to have only one of the two properties.
Perhaps different words could be used to describe the different ideas. One idea:
Technical Simplicity = “Simple”
Interfacial Simplicity = “Clear”, or “Clean”
This semantic metaphor implies another possible distinction
Technical simplicity = fewer steps
Interfacial Simplicity = fewer mistakes in translation
Technical Simplicity vs Interfacial Simplicity
Mentions the difference between Technical Simplicity vs Interfacial Simplicity
like Technical Simplicity vs Interfacial Simplicity?