Then you don't understand logic, fenris_s. "The Resonance is a magical matrix made sometime in the last twenty thousand years by a highly-advanced magical society, because sometime in the last twenty thousand years (corrected the timeline there, sorry) a highly-advanced magical society requiring a magical matrix must have existed.' This is nearly the perfect definition of circular logic - Y exists, made by X, because in order for X to exist, they must have made Y. In point of fact, no - a highly-advanced magical society does not require some sort of 'magical matrix'; it only requires realtime person-to-person communication, which you can get simply from magic mirrors / crystal balls / scrying pools / whatever is similar.
The sharing of information is - like democracy and republic ideals - an aberration in regards to its existence in society. Keeping secrets is far more prevalent, when you measure how much time has been spent. Earthdawn - you know, Shadowrun's official 4th World society cluster, with the highest level of magic to be found in the official Shadowrun world, and which is in fact nearly at the peak of the magic cycle - neither possesses a 'magical matrix' nor has the cyberpunk credo of 'information wants to be free' nor has anything but a master/apprentice transfer of information, especially in regards to magic.
If chris_m2000 - or you, fenris_shonen - want to fantasize and play at your table with 'Resonance is an ancient magical Matrix', we aren't stopping you. But don't for a second believe that the logic that says it is so is anything but circular - or requires assumptions that are massively illogical and/or against the published works.