Most people know about XC through Smash Bros., and that game shows Mecha Fiora as a Spirit unapologetically and clearly named. Honestly, "Fiora becomes Mecha Fiora" is on the same level as "Shiek is Zelda" at this point.

i mean, xenoblade is a story heavy game and mecha fiora is a huge spoiler that completely turns the story around, zelda being sheik is something that makes you go, "uh, neat" when you find out, and has no bearing on the plot because zelda gets captured in the end anyway.

Also, not as many people played xenoblade since the wii version wasn't even meant to be released and was rare back then, and the 3ds version only worked on the New 3ds and kinda sucks.