↑Therein lies the problem. A good intuitive yet complex transformation may be time consuming but it should be doable rather than confounding. I can transform both MP5 and MP36 in about the same amount of time, but MP5 still frustrates me as it's far less intuitive than MP36.
Anything can be easily doable with sufficient practice, but it doesn't make it inherently easy to learn (e.g. 漢字/Kanji).