As part of the mod tools, there is a tool to review and approve suggested edits. The "review suggested edits" shows something like below which is not of much help to review and approve the edit.
It makes more sense, especially on math.se, to show the final form of the post, including the typeset i.e the form it would appear on screen once it has been posted/approved.
This is of more relevance to math.se since most of suggested edits have got to do with some typesetting changes. It is hard to figure out what exactly the changes are and how they affect the post without looking at how they appear on the screen.