I would say in answer to this that the issue is unstable approaches—the approach is too high or too low, too fast or too slow—that are continued to a landing, because there is a higher risk of accident. They may arise for a variety of reasons. The hand-off between, for example, releasing the autopilot and flying manually may have had an effect in some, but it's not something that jumps out at me as a recurring causal factor.
On May 23rd, 2018. See this statement in context.