Largely agree. Heavy process is a tool to help less skilled people have output more comparable to more skilled people. But it comes at a cost of making more skilled people less productive. If you can hire small numbers of highly skilled people you can accomplish a lot with little process. Sadly at some scale “hire only really skilled people” becomes basically impossible and process needs to be more heavy to account for that.
Scrum seems to be more about helping a manager of less skilled/experienced people get more output from them.
As people become more familiar with agile processes in general (we all say we are “doing scrum” but we are also doing more than half of XP - otherwise a scrum doesn’t work at all) those gains diminish and I think among us we can agree they go negative.