alt Hacker News>share-nothing actors
although this is a deliberate choice rather than some accidental defect. Clojure went with STM as its concurrency model, if you're not buying into that and you want an Actor-centric language it's not the right choice to begin with.
STM is seldom used in modern Clojure projects, it is certainly not the dominant model. Most projects I am aware of use a few or even exactly one atoms with immutable data structures.