Because they don't care.

Chat doesn't need a new channel, it needs existing chat to be fixed. Ten thousand RMT shouts daily. Ten thousand Merc shouts daily. No ability to filter, and no F's given because those bots pay subs.

Unity chat is entirely broken, but let's go ahead and add another channel instead of fixing that. Makes sense.

Can't wait for the new chat to be filled with entirely RMT only shouts made by new bots to bypass the "requirements" to be in said new chat.