Javelin

Tied exclusively to ClojureScript, making it unsuitable for projects using other languages or requiring broader JavaScript ecosystem compatibility, which limits adoption outside Clojure communities.

Relies heavily on macros for formulas, which can be opaque to debug and require familiarity with Clojure's macro system, as noted with unsupported forms like def in formulas causing errors.

Admits that circular dependencies between cells result in infinite loops at runtime, requiring careful graph design and adding complexity to error handling in reactive applications.

Has a smaller community and fewer resources compared to larger frameworks, which can slow down troubleshooting and adoption, as evidenced by the basic testing setup requiring npm and karma.