Whoa! I don't edit all of the books.
A lot of the errors you mentioned will be a thing of the past. You have to know the editorial process. An editor marks up a paper copy of the manuscript. That's me, at least for Deathlands and the SuperBolans. I am responsible for the overall content, impose Gold Eagle style, blah, blah, blah. Gun errors that aren't corrected are my fault, though the writer should really be held to account for that. Then a copy editor comes along and fixes the grammar, punctuation other style issues, checks geography and other items I ask her/him to check. All of that is marked up on the paper copy. Then someone inputs all of the marked-up copy onto the electronic file of the book. This is where a lot of the errors are generated, as sometimes copy is dropped, typos inserted where they weren't there in the first place. Sounds like an excuse, but that's the way it is.
Then the camera-ready copy is generated and a proofreader reads the final copy. Starting with Ivory Wave, edting and copy editing was done--and will continue to be done--on-line. Lots of those niggly errors will disappear. I'm confident of that.
P.S. The other problems have to be addressed by the in-house editor, not me, a freelancer. Good points, though.