The "issues" with the existing systems is that they try to solve more than one problem.
Torrents have proven themselves so I cant really criticize them. but IPFS tried to solve p2p, DNS, Data Storage, along with content addressable files... It bit off more than it could chew
I have not looked into Arweave much but going off their site and that they mention bitcoin, and "permanent data" I think they might be making the same mistake IPFS did