> I really don't understand why you aren't eager to explain the differences and what problems are being solved.

Sorry, everybody has different background of knowledge. Hard to understand where the question comes from. I think https://www.usenix.org/system/files/fast21-pan.pdf may be helpful here.

> Why does a user need that? Filesystems already break up files into blocks / sectors. Why wouldn't a user just deal with files and let the filesystem handle it?

A blob has its own storage, which can be replicated to other hosts in case current host is not available. It can scale up independently of the file metadata.

Why does a user need that? Filesystems already break up files into blocks / sectors. Why wouldn't a user just deal with files and let the filesystem handle it?

I really don't understand why you aren't eager to explain the differences and what problems are being solved.