It’s worth pointing out that graphene literally is just a single layer of graphite. Making macroscopic objects out of graphene would mean layering them. So effectively we already have graphene in the form of graphite fiber (also called “carbon fiber”).

Graphite with zero defects and perfect crystallinity has the same properties as graphene. It IS layers of graphene.

(This is all essentially true for carbon nanotubes, too, which are just tubes made of graphene… maybe graphene is more chemically reactive due to the ends of the sheets though.)