More often, particularly in Lingo, they're just not ready for prime time. In your example, a call fails under certain conditions. Chances are that someone started to implement it, ran out of time, or ran into insurmountable bugs, and the product (Director) was released making no mention of the feature because it's not ready to be used yet.
There's a more optimistic variation of this, and that is that the feature was ready for use, but was added too close to the ship date to get a full testing, and so couldn't be mentioned in case there turned out to be a problem. There have been many examples of such features, that all turned out to be completely stable. Hopefully floodfill is one of those.
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