You mean something like this that clearly shows you that you can't stand on half the combats arena?
Yup.
The reason is simple ...
Main problem people had with Shove (as much as i remember) was that they though they are safe, when they are "so far from the edge" ... but the game thought otherwise.
Such tool would help both new players to better understand danger zone ...
And more importantly Larian so they can easily realize that there is no safe zone in their design.