I raise this issue because I see comments such as "in my country this is very standard understanding or style of play" In my country, USA, my guess is 99.9% of the partnerships have no idea what the heck they are playing.
I am interested in hearing your best guess for the rough numbers of worldwide partnerships that have played for more than one year, have some detailed partnership agreements and play competive bridge.
My guess is this is a very small number. My guess is the vast majority of partnerships have little agreements and those that have detailed agreements play little bridge together. Example Hamman and Wolff are no longer together as are many other famous pairs.
My guess is around 5,000 pairs. Keep in mind only 78 pairs made the finals of top usa open MP and maybe 64 -80 teams play in top usa imps matches and many of those pairs are not really long term partnerships. The rest of us play with very few detailed agreements and almost none that are posted here in the forum. But only a guess.
I think back when I played often in club games and tourneys and it seemed most of these partnerships were not long term and the few that were had a few basic agreements but again only a guess. Most seemed to play sayc or 2/1 but with no idea what the heck their agreements were, even at the top levels.
Perhaps in Europe and South America and Asia your experiences are different?

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ing) tr. v. - Any bid made by bridge player with which partner disagrees.