1) The addressing side of IPFS could probably actually be standardized to be as ubiquitous as URLs or email addresses. DNS style stuff is honestly a reasonably good blockchain fit. The storage and server side of it still has a ton of gaps, where lessons learned from torrents are being somewhat inefficiently rediscovered.
4) It sounds like the data available already from those two isn't that simple and is likely to only become more complex over time.
Heck, web2 is still using a ton of web1 components. What are the forces to push some dapp to be fully decentralized e2e?
I think it really is light client development that will make a big change to being decentralised e2e. Being able to talk with the chain directly from an app or webpage without needing to make api requests to a node (be it local or infura/alchemy). If we can get light clients for indexing/search networks too that would be the dream.
4) It sounds like the data available already from those two isn't that simple and is likely to only become more complex over time.
Heck, web2 is still using a ton of web1 components. What are the forces to push some dapp to be fully decentralized e2e?