What are the complaints in the original article about not being able to treat your data as your own?
The complaints as I read them are about pain points in syncing and accessing the different photos you have spread across different Apple devices, and how whatever sync features exist today ("Photo streams") exacerbate rather than improve the situation.
All of them, I think. If any vendor were allowed to drop photo management software (as a first class citizen) on Apple machines, software that would even be allowed to manipulate their current cloud library through an open API - would anybody be asking Apple for anything?
The complaints as I read them are about pain points in syncing and accessing the different photos you have spread across different Apple devices, and how whatever sync features exist today ("Photo streams") exacerbate rather than improve the situation.