Why C++ for Unreal 4?

[=Serapth;18613]
I have trouble picturing too many AAA studios that would hire someone with such a closed minded perspective on tools.
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C#, Java or Python (or any other similar scripting languages) are sometimes pretty nice tool, but obviously improper to some cases. If I have an ultimate tool which can cover everything, why should I waste my time to look up others which cannot cover everything?