With the new constituent layout, useers would like to reorder the constitutent tabs they use more at their convenience. For example if i am a data staffI would be using more often overview Biographical, Participation and notes, but if i am a financial staff I woul be using more Overview, Giving, Propect and Action. So I would want these tabs nore at the beginning.
To add to Pierre's message, I think it would be incredible if users could at the very least add and remove tiles from the overview tab as they see fit, especially since, as of now, opening every individual tab in a profile takes a lot of time. Since it's someting that many of us have to do a lot everyday to get the info we need to the people who need it, this would be of great help.
I'd imagine that such a change would also profit those who are a bit less tech savvy and who are having a tough time getting used to the new interface. With the added customization, we could simply recreate the old interface and please everyone. Just a thought, though!