Hi!
I think Stefan was just pointing out that allowing something that is rarely useful is just needlessly confusing, because it makes you think there is something you are missing.
It may be true in some cases, but in general PHP allows to do tons of stuff that is not useful, or at least does not seem to be useful. But I don't think it's productive to spend time on disallowing such things - same time could be spent developing real features :)
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