There have been filesystems that don’t use strict block sizes - Reiser4 IIRC. It’s not done often because the savings are tiny and it complicates implementatio

There have been filesystems that don’t use strict block sizes - Reiser4 IIRC. It’s not done often because the savings are tiny and it complicates implementation a lot. A bigger problem I can see is that Unix file system semantics is… hairy; see rename(2) atomicity guarantees for example. So it could make sense to replace it not with a typical filesystem, but something more RESTful.