Because it takes time and resources. It is not that you come here, post wish and tomorrow it has been granted.. How old are you ppl? It is in process and sometime it takes few releases to do it. Especially in app like Houdini which is dominantly oriented towards VfX. Why MODO does not have such powerfull vfx tools like Houdini?
I just wanted to say that there will be no need for second package in the future. That Houdini will also be great in modeling. Sorry if I cuoldn't explain myself clearly. English is not my native language. My bad.