The example above demonstrates that the principle of parsimony should be restricted. Another version of the principle, attributed to Albert Einstein, is:
Everything should be made as simple as possible, but not simpler!
Simplicity should be preferred only when it does not hamper other useful features, such as functionality, safety and usability.
The restricted version prohibits any simplification that reduces functionality, safety, usability or any other useful features. The problem with this approach is that it is theoretical. In practice, if one solution to a problem is more complex than a second solution, then the first solution typically provides additional features. In the example, providing keyboard access suits data entry, while providing mouse access is more adequate to special manipulations.
Updated on 28 Feb 2016.