The NPSP triggers that automate opportunity contact roles are built on the assumption that nobody will ever manually update those roles.

When choosing an implementation partner make sure to follow the money and ensure that you're getting unbiased advice. Caveat emptor!

Don't sign a Salesforce contract until you've found an implementation partner on your own. They can guide you to save money and not overbuy.

There are many options for gathering signatures electronically that don't have to involve an expensive e-sign platform.

This is how I built a flow-based state processing engine using platform events. It allows for high volume asynchronous processing of records

Platform events can be a powerful addition to the Salesforce Admin's toolkit. I share some learnings and limitations.