One-step registration is the legacy flow. AFAICT there are no plans to remove it but Two-step is the default going forward. The out-of-the-box UI is support by

One-step registration is the legacy flow. AFAICT there are no plans to remove it but Two-step is the default going forward. The out-of-the-box UI is support by all major pw managers, but you do need to click twice (once for username/once for password)