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by Datenstrom 1916 days ago
I do not believe that is true. Pure FSMs are not Turing complete[1] while behavior trees can be made trivially so. BTs are not isomorphic to FSMs. I am not aware of any system that can be modeled in an FSM and not in a behavior tree.

[1]: https://www.aaai.org/Papers/AIIDE/2008/AIIDE08-006.pdf