What is the reason that we have no rating list for winning faster?

[Uri Blass]

The idea is that engines start from obvious winning positions when the distance to mate is not known(like black without Qd8) and the winner is the engine that win with less moves(it is a draw if both engines mate with the same number of moves).

People already cared to distort rating list by using unbalanced positions so if you use unbalanced positions why only evaluation of +1 and not clearly more than it?

I think that a rating list like that may give important information for people about good engines to analyze in obvious winning positions.