What are peoples thoughts on a writer directing their own work?...from experience.

I work in theatre for schools, as an actor mainly with writer directors, as a writer who's handed on to other directors,and as a writer director. Some of the directors I've worked under were a nightmare to work with. No final draft till opening night, constant direction, constant changes, every terrible line left in, no room for discussion or feedback. Having said that all of those shows had merit, and all of the directors had strengths. One was particularly collaborative and a pleasure to work with. As a writer, I've handed over to others to direct then stuck well away until the show opened. Usually this has been a very fulfilling experience and I've been happy with the outcome. As a director I have only directed my own work. I have a clear idea of what I want, but am also collaborative. Changes to the script are minimal once we start and only in direct response to feedback. I have a theory that if someone has a problem with a line, there is a problem with a line. Even if I don't like there solution I try to fix the issue. The biggest challenge I find as a writer/director is that after working with so many 'protective mother's' I am sensitive about whether or not my work is actually crap, and worry too much about what my actors think. Which isn't necessarily a bad thing because it leads to a real sense of ownership and group cohesiveness...but sometimes I reflect later that I should have stuck to my guns. At the end of the day, I've never worked on a 'perfect' script where every line was brilliant and the director did it exactly right from start to finish, even if they were directing someone elses work. At least when the director has written the work you can question the plot flaws, and maybe produce a better show for it.