[PeterisP]

I agree that they don’t have to support multiple versions of the same thing indefinitely, however they do have to say what they are supporting and for how long they're going to support what.

The fact that Big Sur was released does not automatically mean anything about the support for Catalina, because there are all kinds of reasons not to make a major version upgrade even if the hardware is still compatible with the new version; the major upgrades do break certain aspects of software and implement changes to functionality and UI, not just fixes for security bugs.

The core issue is that simple questions like "Is Catalina being supported as of 14th November 2021 or not" and "Which is the date when Big Sur support ends and you are expected to migrate to Monterey or later for security updates" deserve a clear answer from Apple, and it seems that they are refusing to answering that with any official, published policy.