> Label isn't editable, is it?

No - labels are read-only.

> Why vertical alignment in TextArea is less likely to be implemented?
> Is it harder to be implemented than the horizontal one or some other
> reason?

There is not as much of a use case for vertical alignment in TextArea. Think 
about a typical word processor - it supports horizontal alignment, but not 
vertical, because text is laid out from right to left and is expected to scroll 
vertically.

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