When Cisco is describing Wi-fi 6, they state this about OPEN:
Wifi6…It offers enhanced security for open Wi-Fi networks with encryption of unauthenticated traffic, robust password protection against brute-force dictionary attacks, and superior data reliability for sensitive information with 192-bit encryption.
Also, they state this about 802.1X, in the context of wifi6:
Cisco Network Essentials and Network Advantage licenses enable wireless fundamentals such as 802.1X authentication, QoS, Plug and Play (PnP), telemetry and visibility, Single Sign-On (SSO), and security controls. These licenses are perpetual.
Source: https://www.cisco.com/c/en/us/products/collateral/wireless/nb-06-preparing-for-wifi-6-ebook-cte-en.html