yeah i totally agree they probably couldn't get some manager to approve a real file manager, but that's the type of app that can make people like me believe in the platform.
even windows has options to show hidden and system files, and that is bad enough (to have it disabled by default) i think. There's an entire generation of idiots that doesn't know what a file extension is now.
Anyways, there isn't really any phone "more" for power users than the n900, so they really screwed up in my opinion.