I am the most junior developer at a team of 5 people who act kinda SCRUM developing and maintaining mainly back-office applications.
The problems are:
-PO is kinda promotion for the most senior dev, who is responsible for talking with the stakeholders and writing the stories, makes the calls of what to do and also codes the rest of the time. As most senior dev, she ends up joining the technical decisions of the dev team all the time. Although, she's not the boss, because there are the managers out of the scrum teams.