Tool for detecting and removing duplicates? [Available in 8.10.18]

Product development work for a duplicate management tool aside, it would be super helpful to have a detailed explanation somewhere from you all as to why and how duplicates end up in our accounts. I, for one, have so many duplicate logins and they seem to be replicating. I even have what appears to be quadruplicates for some login items. There are many ways to tackle this widely-experienced issue with 1password, developing new tooling to manage dupes is just one way. Behavior change on the part of us users is also a way to approach this, but we need a good understanding of why the heck all these duplicates end up in our accounts in order to stop the bleeding.