Shell has DSL like nature to it so sh actually is better any other language. But it is not easy to perform introspection or ffi. So basically issues develop whe

Shell has DSL like nature to it so sh actually is better any other language. But it is not easy to perform introspection or ffi. So basically issues develop when you call alot programs with pipe and environmental variables and you need to also have unshare or poll. Like one program I had. Basically calling bunch programs in a pipeline but need to poll output of some shell async. C or python makes the pipe code complicated while emulating async Io with tmp is also complicated. In a few cases, is to have second program in python or c or perl and send messages over a pipe. 3. and 4. are helpful. JIT not so much since bottleneck seems to to be parsing rather than executing.