
Echoing what some others have said:
Option 1: Not every miqo'te follows tradition closely. In Rhio's case, her family line is more Ul'dahn than anything, as reflected by both naming and their complete non-observance of prior traditions. There's nothing to say that a given miqo'te can't come from a more liberal family, or perhaps a family that's broken off entirely from its tribe.
Option 2: There's also nothing stopping someone from being fascinated by a craft later in life. Perhaps your miqo'te did grow up with the idea that armor is light and flexible, with one-handed swords meant as close-quarter weapons... until the first time she happened to catch a gladiatorial fight. I imagine seeing men and women in heavy armor moving like water despite that armor would be quite eye-opening, as if you'd spent all of your life on a three-string violin and then learned that there's usually a fourth string.
Option 3: If neither of the above apply, there's always obligation. Maybe it's the feeling of owing something to someone else (possibly a paladin) or maybe it's just a matter of not having the real option to avoid heavier armor. Rhio has openly stated in the past that she's more comfortable with wielding two blades than the sword-and-shield style... but Eorzean smiths cast everything weighted for sword-and-shield, so she's had to adapt. Sometimes availability dictates action.
Option 1: Not every miqo'te follows tradition closely. In Rhio's case, her family line is more Ul'dahn than anything, as reflected by both naming and their complete non-observance of prior traditions. There's nothing to say that a given miqo'te can't come from a more liberal family, or perhaps a family that's broken off entirely from its tribe.
Option 2: There's also nothing stopping someone from being fascinated by a craft later in life. Perhaps your miqo'te did grow up with the idea that armor is light and flexible, with one-handed swords meant as close-quarter weapons... until the first time she happened to catch a gladiatorial fight. I imagine seeing men and women in heavy armor moving like water despite that armor would be quite eye-opening, as if you'd spent all of your life on a three-string violin and then learned that there's usually a fourth string.
Option 3: If neither of the above apply, there's always obligation. Maybe it's the feeling of owing something to someone else (possibly a paladin) or maybe it's just a matter of not having the real option to avoid heavier armor. Rhio has openly stated in the past that she's more comfortable with wielding two blades than the sword-and-shield style... but Eorzean smiths cast everything weighted for sword-and-shield, so she's had to adapt. Sometimes availability dictates action.
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In-character: Rhio's dossier | Out-of-character: Player profile
In-character: Rhio's dossier | Out-of-character: Player profile