For example: realtime systems, rendering threads, embedded systems that require minimal runtimes. Smaller subroutines on the whole don't really need it, and tho

For example: realtime systems, rendering threads, embedded systems that require minimal runtimes. Smaller subroutines on the whole don't really need it, and those small performance gains can add up considerably in an intensive system. GC is mainly useful for things with undetermined lifetimes. Glue code essentially.