In an ongoing project a translator needs the possibility to sort by "last changes in reference language". The "fuzzy" flag isn't safe to rely on.
I'm a voluntary translator (of many) in a project, where the reference language is changed by different developers, and most of them only have the right to modify, but not to manage. And non of them is using the "fuzzy flag for other languages" since the day the main designer has left the project (who was the only one using that flag).
And currently the reference language is undergoing a maintenance cycle, some changes needs to be reflected in other languages, and some are only typos. I'm lucky to have access to the reference language too and can see there when something has changed. But almost all other translators aren't this lucky and can't see any changes that were made in the reference language.