I’ve been farming out my four yet unpublished novels to freelance editors. On one of the stories the editor wrote back suggesting the proper placement of black moments, the development of story arcs (in this case more intermingling of some of the main characters) and the need for more backstory here and there. This editor also loved the story and wrote using these terms: gripping/dramatic/gritty/emotionally-wrenching tone/distinctive and compelling narrative voice/brisk pace/multi-faceted protagonists, colorful cast of secondary characters, complex villians. She edits for Harlequin which follows formulas. I use Christopher Vogler’s The Writer’s Journey or Story by Robert McKee (as prime examples). In short, this particular novel (romantic elements) follows a general fiction path unsuitable for Harlequin. But she also makes a point about how I can improve it.
BTW, if I made all the changes my editor suggested, I'd be at 120,000 words! Harlequin would say no because it wouldn't fit their word count guidelines.