Not sure if Sansar plans use to 'instances' of repeated meshes in an Experience, it could certainly save resources.
I would like the ability to swap out mesh objects for others. Perhaps I am blocking out an Experience with simple mesh, and swap it out later.
Then if I wanted to swap out Column_A (that has copies Column_A(1), Column_A(2), it won't be as daunting or horrible as it is now.
Some of us are still learning how to piece things together, so don't necessarily want to have to model complex shapes to try out floor plans, mazes and etc.