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As an affiliate, I'm sure this makes a lot of sense to you. But for the majority of us who are not affiliates yet, this locks us out of the ability to brand our stream and build that brand into a successful affiliate-worthy channel. Your idea is good for users who are already affiliates, but very BAD for streamers who want to grow to that level. SabinJr is a personality, but xBB3fp8Ry has no chance to grow.

But besides that, Twitch is a social platform. This isn't 4chan where Anon rules the house. We have names, identities, and friends. Our username is what we are called when we see our friends in chat, and it's what streamers call us when they see us in chat. If I stop being SabinJr and just be xBB3fp8Ry, it will be impersonal and boring. Most people would leave Twitch, I think.