When you mentioned this the first time, I asked the published authors on wattpad about it. They all said if the editor changed all pronouns to proper nouns, get rid of the editor.
Context would probably help, here's one of the (most recent) segments, with the highlighted pronouns replaced:
He leaned in, waiting for him. Taylor fought the impulse to jerk away, letting Jacob kiss him. He was tense and rigid when their lips met. However, when they did, he found himself lost in the kiss. It was nothing like making out with cheerleaders. It was as if Jacob's soul rose up, entered him and flew around his stomach. Jacob's tongue ventured into his mouth where he welcomed it. His hands started roaming, running along Jacob's arms-which were surprisingly firm. He reached around and grasped his buns, which were nice and tight. He even flexed them for him, bringing a smile to Taylor's face.
As you can see, it's hardly every pronoun, and I'll admit, it does make it clearer, but again, it ends up with one name "Jacob", being used five times in one paragraph, while the other "Taylor", gets repeated twice. That's a lot of repetition!
I'm not about to fire the editor over this, as he's got some excellent suggestions, but his is a more general question about priority, specifically, how much repetition is justified to make a passage clearer, and whether readers even notice repeated words/phrases/names?
By the way, no offense to the editor, who I won't name here, as I'm not attacking him or questioning his suggestion. I'm interested in other authors' opinions about which techniques get prioritized when writing.
P.S. With my other editor, she again didn't replace every pronoun, but each time they were referred or quoted in a new paragraph, she'd repeat the name instead of expecting readers to remember who was last talking.