Hype has those same text alignment keyboard shortcuts (well, except for justify); this is specifically about the ones in the Arrange menu.
We take a conservative approach to keyboard shortcuts because there might be more important functionality later that would work out better for users. It isn't good to change them; I consider any shortcut pretty much permanent. We've only changed shortcuts 1-2 times total in the whole life of Hype.
Apps that have shortcuts for this functionality has probably also thought them through, and if users are familiar with them then it means less learning on their part.
I like those!
As the system provides this facility, it isn't likely we'd duplicate the effort and do this as a feature. Not to say it couldn't be improved for specific Hype cases, but there's much bigger features to fry when a workaround does exist .
Users have often requested that the align/distribution tools have specific buttons which I think is fair, so it would make sense to evaluate shortcuts at that time too.