You talk about "strange" writers and some you can tell right off the bat that maybe they have birth defects of the membrane or something of the sort. I write under a pseudonym. The pseudonym is [redacted]. There are a variety of reasons I do this none of which you will be interested in. Nevertheless, in your experience, if somebody sends in manuscripts under a name that is obviously a pen name and a slightly strange one too, does that make you view the manuscript any differently?Yes.
Why wouldn't you want your editor to know your name? What name would the publisher put on the contract? Under what name would they file the book for copyright?
A pseudonym is what you put on the book. If you want to go full-on Lemony Snicket or Pseudonymous Bosch, the marketing department too can use only your pseudonym. But you can bet Daniel's and Avi's editors know their real names.
Those authors are perceived as "quirky". If you really, really, really don't want to tell anyone your name, that's going to be perceived as "wacko".
So let's assume you can somehow figure out the legal ramifications of having your work copyrighted to somebody who doesn't exist and having your checks made out to someone who can't open a bank account. As you may have guessed from this blog, editors treasure and adore the sweet, stable, wholly-in-their-right-mind authors.
We meet lots of people under the mistaken impression that they need to be bizarre to be seen as original. That being imaginative is an excuse for being impossible. That being an artist is a substitute for being honest.
No. The unbridled freedom of your creativity does not give you license to behave like a total weirdo. Feel free to wear your wolf suit when you go visiting the wild things. But if you expect any damn dinner, you'll put some pants on.