Generally, that's true. But what happends usually is that something starts out as a quick small script, but later it grows, more features get added, etc. The end result is not really fit for a scripting language. There are more and more and more apps that are being released like that, and it seems like applications seem to run slower and slower, with a few exceptions. That's kinda wrong
But offcourse there are good uses for it.
For example, a good backend program coded in for example c++, with a scriptable frontend.
The reality is, very few, next to none script-based applications that I see are coded like that.