Many features overriden out of the box

I cross posted this in the OA issue queue already but no response yet. I've got a number of similar questions and will be sure to post here first in the future.

I'm attempting to grasp the OA/Panopoly architecture so that I can be aware of overriding code and using Features Override to manage it, but it's turning into a quagmire because so much is already overridden out of the box for unknown reasons.

I can't find anywhere that describes the "needs review" label that appears occasionally in the Features UI - not even sure which module is responsible for it, Features or Features Override. Why does that show up and how is it different than just stating it's overridden? Just as an aside, I've always wished you could hover over a section and you could see which module is responsible for it.

At admin/structure/features, the following modules are overridden (again, this is a virgin Pantheon setup):

Archive, Config, Discussion, Events, Event Imports, Media, Messages, Panopoly Users, Permissions, Sections, Subgroup Intergration (sic - note sp. error) for Spaces, Teams, Wiki, Work Tracker.

As an example, within the Discussion Feature, Field Instances and OG Permissions are overridden.

I was looking at the node edit form section of Page Manager and noticed that all of the OA pages are overridden. (/admin/structure/pages/edit/node_edit)

Any of the variants, Space, Team, Wiki, etc are all listed as overridden but attempting to drill down doesn't give a clue as to why. I can't find them as features either, nor can I find where the code lives.

I have a lot of experience on D6 but little on D7 and at first it seemed like distributions made a lot of sense until I realized the pitfalls and limitations of using Features. It's beginning to look like a maintenance nightmare and more trouble than it's worth, though I hope I'm wrong and there's something I'm just not understanding yet, or these are just bugs.

Tnx,

Jeff