The developers of symbiosis were able to take advantage of different cross chains and combine all the advantages into one cross chain. This is really cool, because now swap takes much less time, and the system itself is more secure. They also say that through symbiosis it will be possible to transfer nft between any blockchains, this is a great achievement for the entire crypto community, because previously such operations could not be carried out. And I see the cost of one network node as a big advantage, maintaining a node is not very expensive and this allows you to increase the number of nodes and create a real large decentralized network!