Now, you may be asking yourself, why didn’t they use Figma, or Sketch, or Photoshop (lol), as their single source of truth? As much as we love Figma, we know that design tools come and go, but our icons are forever, so Github made the most logical sense. And given that it’s where our code lives, it kept things simple too.

Good "don't keep your assets in your flavour-of-the-month design tool" evidence.