indiglo is exactly right; the Mentor program is where a writer belongs if they really want constructive feedback on their writing. Editors are only there to check your spelling, grammar, and punctuation. It is not "quick and simple" for them to do otherwise. They are working in an entirely different area of the EF website to do the editing, and in many cases it would take a considerable amount of time for them to point out the multiple things that a contributor needs to work on. That's the Mentors' job.
Uninvited pointers would also be a waste of the Editors' time in the case of the contributors who don't care to hear anything but praise.
That said, a lot of Editors would be happy to answer you if you have specific questions about the changes that they made to your review during editing. Though if you're serious about wanting to improve your writing, again, a Mentor class is the way to go.