Feathers

Feathers is primarily designed for use with Node.js and JavaScript, which can be a limitation for teams preferring other languages.

Setting up authentication, authorization, and real-time features requires significant configuration and understanding of the framework's architecture.

The official documentation is strong for basic usage but lacks depth in explaining more complex scenarios such as custom middleware or deep integration with external services.

Feathers uses Socket.io for real-time communication, which can introduce performance bottlenecks when handling a large number of concurrent connections and events.