I agree that the asset editor is something that needs to be added to the console version.
Either that or add parking lots into the base game (was really hoping that they would be announced as a part of the Campus DLC because then at least we could have a bit of hope that they will come to console when campus comes to console but this now looks very unlikely).
Creating parking lots is basically the only thing that i have used the asset editor on PC for. But i know other people use it for many other things like creating their own parks or intersections. So its definitely something that would be very useful to have on the console version.
Also as for why parking lots are needed. Because they make the cities that you create look even better and even more like real life.