I understand this changes but I don’t like. Looks like I will not update my Quest from now on.
Today, we’re announcing some important updates to how people log into Oculus devices, while still keeping their VR profile. Starting in October 2020: Everyone using an Oculus device for the first time will need to log in with a Facebook account; if you’re an existing user and already have an Oculus account, you’ll have the option to log in with Facebook and merge your Oculus and Facebook accounts; and if you’re an existing user and choose not to merge your accounts, you can continue using your Oculus account for two years.
Source: A Single Way to Log Into Oculus and Unlock Social Features | Oculus