So are you saying that the pen name thing is problematic only for people who wish their real name to be a secret, or is it problematic for any one, for example, yourself? In what ways has publishing under Madeline Howard been more problematic for you than Teresa Edgerton?
But I
was forced, for over a year, to keep the duo-identity secret. So for me it was a problem in all the ways that I mentioned, and more, because of personal reasons particular to myself. Even since I "came out" (as you might say), it still adds an unnecessary level of complexity. And since most people's lives are complicated enough these days, I think that anyone who considers taking on a pseudonym should think about it carefully before deciding whether it is more likely to complicate or to simplify -- and also be sure that fears about using their own name are truly valid.
Darksaber's statistics are sheer nonsense, by the way, and mygoditsraining is right about the paranormal romance. DS turns out to be an alias for someone who likes to turn up here from time to time under different identities and annoy the moderators -- so not a trustworthy source of information.
Potential problems with another career obviously need to be decided on a case-by-case basis, but I think that anyone who is considering such a change should talk with people who have already done so for similar reasons, to find out whether, in retrospect, it was really worth it. Many will probably say that it was, but those might not be the ones whose situation most closely matches yours.
The same with worrying about the sound of your name, and whether or not people are likely to misread it. (In my experience, no name is safe from this.)
And I am not reluctant to talk about why I am using a pseudonym, it's just that it is a long story that I've told many times before. You can, in fact, read all about it in this thread
http://www.sffchronicles.co.uk/forum/9817-concerning-pseudonyms-and-other-publishing-perils.html