I've moved this to a new thread, because it is a slightly different topic.
ArM5D is a definitive compilation of the Fifth Edition Rules. If you thought the original Virtues and Flaws chapter was intimidating… By file size, the new one is more than three times the length.
There is no way to create a core book that is a comprehensive reference for established players and an easy introduction for newbies, at the same time. An easy introduction for newbies must not contain too much information, and must be organised to take people through learning what to do. A comprehensive reference must contain all the information, and be organised for ease of reference. These are contradictory requirements.
So.
Ars Magica needs a Starter Set. Absolutely. That is a different project from ArM5D, however.