That's a very unique definition of "distributed". To many in the field, "spans multiple hosts" alone is sufficient. Some might refine it to preclude single nodes with special roles or by adding requirements such as a single view of the data etc., but it's a joke to add atomicity or implementation details such as how a consensus algorithm is used. There are plenty of distributed data stores that don't provide atomicity for all operations, and users are happy with that. There are plenty that use leader election instead of consensus to deal with consistency issues, and users are happy with that too. Inventing a novel and highly specific definition to exclude them seems more than a bit disingenuous. If we want to go that route, I'll point out that HopsFS is misnamed because it's not a filesystem according to commonly used definitions. There are many hard problems that it wimps out on, that a real filesystem must address.
"Operations that cross volumes do not solve the consensus problem, so they do not execute operations like move atomically."
Again, you seem to be using "volume" in a very unique way. Your architecture might misuse "volume" to mean some sort of internal convenience that's practically invisible to users, but others don't. To most, a volume is a self-contained universe, much like a virtual machine. Users are well aware that moving data between either will not have the same semantics as moving data within.
Such desperate attempts to disparage systems you obviously haven't even tried to understand are not helpful to users, and are insulting to people who have spent years solving hard problems to address those users' actual requirements. Believe it or not, systems exist which don't work like yours, and which prioritize different features or guarantees, and there's demonstrated demand for those differentiators. If you want to learn about those differences, to compare and contrast in ways that actually advance the state of the art, please begin. I say "begin" because I see no evidence that you've attempted such a thing. Does your academic employer know that you're misinforming students?