Hang on, it's not automatically generated. What happens is, you put a name in, and then there's a link on the Finder that says "start a new Talk thread about this name" and if you click on that, this OP automatically words itself, and then you still have to click 'start conversation'.
So the OP does still have to choose (twice!) to start a Talk thread about the name.
My apology was aimed at the fact that I has assumed, in light of the identical wording of several threads, that they belonged to the same poster. I was wrong about that, Mumsnet generates the wording. But the poster still chooses to start a thread in Talk. Again, they have to choose to start it and to then post it, it's not an accident. Otherwise every second Baby Names thread would look like this, wouldn't it?
So, Aitch, with much respect, I think you've misunderstood. It's not automatically generated save for the wording.