It was mentioned a few times around Sword and Sheild's Launch.. I remember GameXplain doing a video about it.Made an interesting observation on the Nintendo Switch displayed in the players room. The Joy-Cons on the Switch will match the color of the ones that you are using to play with.
Had I not been using my white Joy-Cons, the red, blue, and gray Joy-Cons are something I would have thought nothing of. Is this a known and documented aspect of the Sword and Shield?