Keep in mind that things like Agile and Scrum might have had buy-in from team members because a team member adopting it wasn't as high of a cost as the same team member leaving the job. You might be able to object, but you'll probably be overridden.

There's some amount of reprogramming that happens there to keep the team cohesive, so people might begrudgingly adopt new habits. So in those cases, "it works" is barely sneaking in because everyone was forced to make it work.

It's not as easy to prove/disprove as more objective things like program performance, size, or correctness. There's a whole lot of flavors of "it works" out there.