The Lvl. 70 SMN quest has some interesting things to add. There we see an Allagan computer "running" off of SMN soul stones and able to use techniques in the soul stones. Namely the techniques that have to do with making an egi. It seems that certain techniques are tied to soul stones (creating SMN egi, SCH fairy living in one, DRK's Darkside coming to life, etc.) and are primarily taught that way instead of "from scratch".

It also shows how old the idea behind Soul Stones are. Not only did the Allagans know what they are, but they had multiple soul stones all of the same job (other jobs with multiple soul stones are PLD and NIN). Given that societies at every level of technology have Soul Stones associated with them, they must not be that hard to make and relatively intuitive to figure out how to use/make. Otherwise I'd have a hard time seeing jobs like WAR associated with them...