The decoy function exploded everyone's interest in the Fey Fianna!
The product suddenly became a lot more attractive once people found out that the fey could do more than fire weapons or form energy shields!
It was not as if those primary functions were weak or worthless, but these were already jobs that other mechs could already fulfill.
In other words, a mech force did not actually gain a lot of new capabilities after adding the Fey Fianna to their lineup. They just received a bunch of odd machines that could control a lot of smaller machines to do the same stuff as usual.
While the product reveal had made it clear that the fey possessed nuances that made them better in many situations, they still failed to introduce anything that was radically new and different.
That changed when the fey showed that they could imitate mechs well enough to fool enemy sensor systems!
