In addition to my previous post, the same Sorites problem affects relationism, which is a metaphysics of presence insofar as it holds that relations are more real than the entities they instantiate.
Thus boundaries are a problem because my leg only exists because of a leg bone, which is connected to the hip bone, which is connected to the torso bone, which is connected to the human bone, which is connected to the ecosystem bone, which is connected to the Solar System bone, and so on. Where do you draw the line?
This problem goes away if relations are not ontologically deep. It's only a problem when we hold that the network of relations is more real than what appears in it--if in other words the network is a metaphysically present thing.
To assert this is to regress to structuralism. Structuralism is the most elegant relationism ever devised. Derrida was already past that. We must move beyond.