The ratification of WASI 0.3 with native stream<T> and future<T> in the Component Model finally solves the non-blocking I/O dilemma for WebAssembly. Instead of spinning up separate containerized microservices and marshaling JSON over local loopback interfaces, we can compose polyglot components in memory with zero-copy stream piping. It delivers strict sandbox tenant isolation with microsecond startup times and zero network serialization overhead.