Paper, wood, and traditional media aren’t tied to one vendor. They don’t require licenses or agreements. They aren’t, generally speaking, incompatible. If digital art is going to provide artists with the same freedom, it stands to reason that artists working with computation will find ways to make any pixel their medium.
Processing is a good example. It takes some time, but eventually, the understanding dawns upon you: Processing is more a design for how to code, an API, than it is a specific platform. Taken further, heck, it’s more like a way of life – sketch on paper, write simple code, prototype fast, make something happen.