And it is not like making a copy for cheaper isn't something that requires skill and innovation. Or then iterate on that copy. Didn't Roomba just fail to these copies. If west was truly so much more innovative and better shouldn't they as company be infinitely ahead still?

That depends heavily on where the cost saving came from. For a long time China made cheap copies with extremely cheap labor, though that may no longer be the case as it seems they're innovating on the manufacturing process these days.