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By going UTF-16, he would make the game much more accessible to those not using a latin alphabet.

If I was designing the game, I would favor internationalization vs space efficiency in the virtual computer. That way russian kids would get to have fun learning to write silly programs too.

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UTF-8 still has all the characters UTF-16 does it just uses more bytes to encode them. UTF-8 makes more sense if most of your characters can be represented in 8 bits.

you can encode all characters in the basic multilingual plane with a single utf-16 code unit, while in utf-8 BMP characters have variable lengths from 1 to 3 bytes.

If Notch only allows BMP characters and uses utf-16, internationalized string maniulation is very easy, as easy as ASCII for kids to mess with.

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