Engineering means lots of documentation. Catalogs of parts. "Red rubber balls", listing all the variations and properties. Standard forms of documentation. Need to describe a file format? Here is a prescribed way to do that. So yes, software is not engineering yet.

I think the reason is that component interoperability problem remains unsolved. The aim of OOP was that; at least Brad Cox saw it this way. One of entries in his blog said something like "software product related to security should not provide security; it should provide tools to build a secure system".