The design guidelines for iOS currently recommend using the autofill feature for authentication, which don't use the app based keychain. Saying that, we still

The design guidelines for iOS currently recommend using the autofill feature for authentication, which don't use the app based keychain. Saying that, we still use the keychain to store a login token, and, also been under pressure to not do it the recommended way as it's slightly more convenient for users to store and then restore credentials without the additional authentication check autofill does, according to sales.