That’s an odd way to look at it. It’s kind of like saying, “You can press c to copy; you just need to to press ctrl first.”
But you are correct that other generic chatbots use enter to submit.
I wonder, though, who the users of the official ask.discourse.org really are. I have always assumed, perhaps incorrectly, that people use it to problem solve the software on their own sites in place of posting questions here. I’m constantly having to paste things like error messages and the like into longer responses.
In any case I do appreciate the service. I’ve used it for many problems I have encountered.