Defining common objects - response to wcag issue 1902

Hi Folks
https://github.com/w3c/wcag/issues/1902  discusses the understanding
document for accessible authentfication:
Recognising common objects, or a picture the user has provided, would not
be a cognitive functional test.
:

On the call we wanted to respond as follows:  Coga thinks common objects be
removed from the understanding document , as it is often hard to know what
they are , and common is not always common in different culture.

Any objections?

All the best
Lisa