What's the problem with having multiple users with the same UID?

I've got three edit systems connected to the SAN using open directory off our server.
I want all edit systems to have read/write access to everything created. I don't need to protect anything from any of the systems. With all three systems logged on using the same user, I never have to change permissions.
The other cool thing about this is that Final Cut Pro will let me know if someone else is modifying a project that I have open with the warning:
“The project "projectName" has been modified externally. If another user is working on it, saving will overwrite their changes. Do you still want to save?”
This sounds great, right?
RED FLAG!!!! Apple gives the warning in this article:
http://docs.info.apple.com/article.html?artnum=302450
"You should not allow two users with the same UID to access an Xsan volume at the same time."
So why is it bad to have two (or more) users with the same UID?
I can see that in some situations it means that you can't prevent people from read/write privileges. But I don't want to restrict privileges.
What am I missing? With all of these warnings, it seems like if I do this my edit systems could all explode or something. Please help me understand the potential ramifications of having three users have the same UID.

Hi Russell,
1) If you have OD set up and "editor" has UID 1111, then when they log in to any machine that's bound to OD as editor, they will get UID 1111. Therefore, there won't be any of these permission errors. This is typically the recommended approach.
2) I assume you mean "You'd prefer to not using open directory?" Whatever the case, OD isn't mandatory with Xsan -- it's just that with multiple user accounts, managing them centrally tends to be easier. For 3 or 4 accounts and 3 or 4 machines maybe it's no big deal. If you go larger, it could get a lot more complicated. That said, if you set it up such that each machine has the exact same set of users (as you said, Mary = UID 502, Fred = UID 503, William = UID 504), then you can do what you want. Mary can log in from multiple machines at the same time, and in general you won't have permissions problems. Of course, if you try and read and write the same file from multiple workstations at the same time, you will get file locking issues, which will prohibit somebody from successfully writing the file.
File locking issues are different from general permissions errors. The former basically says "hey, someone else is editing this file. Therefore I won't let you edit it right now... you can read it if you want though." Permissions means somebody saves it, and Xsan thinks you saved it and own the file, when you really don't.
Quad-Core PMG5, 4 GB RAM, 7800 GT, 1 TB disk.   Mac OS X (10.4.4)  

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