As an example:

Specially with the new house fix where you have to place random signs around and wait for them its frustrating to go bump into signs not knowing what they are or why your getting blocked. Anny form of simple indication of what the sign might turn into can give you a hint of whats blocking you so you can either walk around or bash it in the case of hostile houses placed front of your gates.
Server side only the name of the object being constructed have to be attached to the information getting sent out. Client side a bit of effort would have to be put in to make it work.
It would be a great addition specially how much signs being used to store items in. Bumping into random sized signs feels cheep cause your blocked by invisible objects as well as cause issues when they are abused in pvp.