[pfandrade]

iCloud Keychain is handy for simple use cases. But it quickly breaks down if you want to have a good password habits.

For example, I use my Apple ID to login to a bunch of different Apple sites. With the keychain that would create separate entries for each site although they are the same. Change your password and you'll end up with items with outdated passwords (which you'll only find out when you try filling them).

The keychain is also cumbersome to create items manually (imagine you need to save an SFTP or VNC login?). Furthermore how would you have access to these items on your iOS device?

You also can store more than just passwords with Secrets.

[stephenr]

Recent versions of Keychain on OS X/macOS (and iOS I think) ask if you want to change other entries with the same username from the same domain (i.e. appleid.apple.com and developer.apple.com) when it detects a change.