Where are the lessons learned from these integrations? We are currently 15 years into the dot com malaise and there does not seem to be good project managers or decision makers who recognize what they need requirements-wise and then what it will take to bring a person/team/company into the fold.

Hate him or love him, Zuckerberg has a team that integrates. Instagram was brought into the fold at Facebook and there has been little to no rumblings across the board from the users to the developers. WhatsApp has been left alone at Facebook and I still use it.

The integration teams exist, but the processes and/or politics are killing the integrations at a lot of companies.