I'm a small potato, I doubt I'd even get a response from SS.
My opinions: the "public domain" rejection is dumb and shows someone mindlessly applying a checklist. An expert photographer (like some of you) could make a case that the one rejected for "focus" could be even sharper, or that the one rejected for "lighting" isn't as beautiful as it could have been. But both of them are more than good enough, and are just as good as many others I've submitted before.
Another of my opionions: some of these reviewers have grown up in the 'vector' world, and have looked at so many perfect renderings of common objects that when they see an actual closeup photo of something like a hand tool, they don't get it - things like the actual surface texture of the object, the limits of DOF, etc. - they think everything should be smooth and razor-sharp like a CAD rendering.
I think I'll just wait a few weeks before submitting any more. Maybe the new group of reviewers they just contracted will have calmed down by then