No bark band? (in addition to mel bands)

I guess it’s a bit late in the game for this, but is there a reason there isn’t a native bark bands analysis (in addition to the mel bands)?

Could be useful in certain contexts.

Not late in the game. Various implementations of various imperfect human-hearing modelling are on the wish list for a few years now. Since the code is now open, you can try to implement one, since this is the only blocker: development time.