Replacing the editing pop-up’s with tabs does have some benefits. However, I often find myself having to refer to the main screen as I edit. (Getting old and my memory isn’t what it used to be). To accomplish this in the proposal two additional steps would be necessary; pull the edit tab off into a new window and then resize it. Probably would still have to scroll the new resized window.
Less common, I occasionally have 2 editing pop-ups open at the same time. That would double the additional steps.
For me, scrolling a pop-up is preferable to the nuisance of having to manage the tab/new window. I could, however, live with the change. It wouldn’t be a deal breaker for me; just an aggravation.