Given the source code was stolen and distributed for free when HL 2 was in development I doubt they would announce (or even hint at) 3 until it was already finished.
It's called a character arc..... most characters are just born a badass. (unless we are talking comics/manga/fanfic) And do you really expect a fourteen year old girl to fight off multiple adult males and come out unscathed. The only time she was dead weight was when water was involved.
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