Anecdotal, but I am a HM. The process goes I review cvs with senior engineers, we filter, 1 tech interview to validate cv, one with me to validate decision. Done. 3rd interview only for someone who would be a HM themselves. To be fair, if we could validate that cv is accurate we would not even need the interviews. Junior people are our responsibility to develop, senior you can understand their fit with some key indicators. I believe the detail in recruitment either reflects lack of trust in team or focus on accurate placement of people, which does not lineup with my expectations about how a team of creative people should be run.