Live, for one, comes with a full blown programming environment called Max for Live, where you can create all kinds of things on par with native plugins and controls.

But the more essential question is: does it matter?

If one is experimental electronic musician / sound artist, it might be worth it.

But the average musician wants a good environment with the features they need built-in (and easy access to quality third party plugins etc for FX etc), not to tinker (and even less so, in C/C++) with their DAW.