The "learned to control and bind" part makes me thing that the fairies were already excisting beings, and that the SCHs learned to control them. Somehow bind them to themselves and co-operate with them. (I'm using co-operate here because they indeed seem to have a will of their own).
The only thing that I would add to this is that the only difference between 妖精 "yousei", and フェアリー "fairy" would be an eastern or western perspective. Yousei could be any kind of friendly magical... thing. While "fairy" specifically concerns the western image of (butterfly)winged tiny human like beings. In practice though.... they are likely to be the same.
For FFXIV specifically, this possibly means that "fairy" is a type of "yousei" (or in english, that "fairy" is a type of "sprite", which means there may be other types of sprites). Building on your translation I would translate it as "accompanied by their sprite familiar, a "Fairy""



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