Much, perhaps most, of the effect we have as individuals in large organizations is indirect and hard to see or quantify. It's not always as simple as we think and changing course of a group almost always takes time, education, repetition, and some redundant effort. It's still worthwhile and effective.

It is entirely possible that this is a success story of a lower-level engineer raising an issue that the higher levels then addressed.

Just because no one immediately jumps and say "by golly, we have to get rid of component X right now!" doesn't mean that the issue didn't begin percolating vertically and horizontally, ultimately resulting in a large-scale corrective effort.