I don’t see it as acting “like a teenager”. These eccentricities seem more to me as being representative of a person who knows all the rules (both formal and informal), and has decided which ones are worth breaking – whether it’s for personal comfort or if it’s for a more purposeful reason, that I can’t say.

Complaints about her demeanor remind me of people who complain about nurses with tattoos or dyed hair for being “unprofessional”. They clearly have the resume and skills for the role.

Did Picard or Janeway outlive all their friends family and comrades.

I personally have several issues with the show; but Ake’s posture is certainly not one of them – In fact I kinda like it. She’s giving me Guinan or Dr Who vibes portraying an outward silliness that hides an inner sadness and seriousness.