Unknown errors

This is only marginally related to Paradox in any of its forms, but related
to programming in general. On an annoyingly regular basis, I see the
following on MySpace:

Sorry! an unexpected error has occurred.
This error has been forwarded to MySpace's technical group.

Thinking about the programming books I've read over the years, the ones
which deal with good programming habits in any language, the idea of an
"unknown error" strikes me as absurd, at least for any application* that's
been around for a while. So, when I see this on MySpace, my first reaction
is "sloppy and they don't give a damn as long as the advertising revenue
keeps pouring in". Am I being harsh? Partially correct? Opinions wanted.
Assuming I'm trying to access a feature that's not new, is there really any
such thing as an unknown error?

* I'm choosing to consider web sites to be applications at the moment.


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