Yes the progress is very slow. I suggested a “research” approach a long time ago in which a database should be built to analyze the problem but the community do not seem to get it.
A problem that is quite hard to study like this will always require extensive data, there is no other way around that. We failed from the very first step of pinpointing the problem. In this regard, notebookreview is now years ahead of us. This forum remains to be individuals ranting about themselves without any proper approach, hence the slow progress.