The limitation is primarily due to the lack of mirrors in IPFS. If I use IPFS Desktop, I can see everything that I share and it all works really well. But trying to share a link with someone else is extremely slow because the network has to hunt and find my server across the entire network.  Combining that with Nostr nodes that are specifically designed to help with large file mirrors using the Filecoin and IPFS infrastructure would work, but it would take a serious effort to make the connections between the layers.