One of the things that had bothered me the most is the fact that there is no "direct" way to get the current post author information.

This is because there is not something like "getCurrentPostAuthorInfo" or something... Or at least I have not stumbled upon it yet.

None the less, it is possible to get an author information using "getCurrentPost" and then "getAuthors" (from 'core/editor' and 'core' respectively)

getAuthors actually have a lot of information of the author including meta. So, filling the gaps may be relatively easy too.

(I have yet to test myself it)