There's also the argument that even carefully hidden arts can be justifiably learned by someone outside of the usual ways except succor, let's not go there. All Fists of Rhalgr use chakras, but not all chakra users necessarily have to be Fists. Someone could have broken their oaths and helped develop the technique outside of Ala Mhigo. A Sultansworn could have showed secret paladin techniques to those not affiliated with Ul'dah. We know there's more than one form of Thaumaturgy around because the game does allude with a wink and a nod to the original 1.0 THM schools.
Is it snowflakey? Yeah, sure, but it's also your character and your backstory, so do as you will.
Is it snowflakey? Yeah, sure, but it's also your character and your backstory, so do as you will.