This is primarily due to the slowness of adoption in the IT industry to some of these technical innovations. This slowness is a reaction to ill advised attempts at applying sound software engineering and project management principles in the past.
That is why I have committed my professional career towards a more prudent adoption of these innovations. Process, methodology, and architecture should always be in the service of lowering development costs, raising quality, quickening time to market, and achieving other well articulated strategic business goals of the hosting organization and not as a reaction to the marketing evangelism of technology vendors.