Many years ago I did some consulting at Telstra and I needed a billing module for their upcoming online gaming platform. Another division had almost the exact thing I needed. I asked my stakeholder if we could reach out and talk to those folks, get a copy of what they'd done and implement with few changes. He almost laughed out loud at the suggestion and told me it would just be far easier to a new one from scratch.

Internal barriers are sometimes far greater than external ones.