There have been a lot of software development methodology but one thing that's been overlooked a lot is the competence of the people doing the execution of the project. I am talking not just about the developers / engineers who are building the product but everyone across the pipeline - product owners, business stakeholders, process specialists, business analysts, project managers and just about everyone else.
People attribute failure to the process because it is demeaning to put the blame on people when established best practices can receive the finger pointing.
Stop the notion of being nice to the lack of skills of people. Hiding behind being nice does not resolve the issue but rather propagates it. Fix the issue by providing the grounds for people to learn and become productive.