but when I try to add caps like this:

radosgw-admin user create --uid=superadmin --display-name="Admin User" --system
radosgw-admin caps add --uid=superadmin --caps="users=*;buckets=*;metadata=*;usage=*;zone=*"

I cant then list all the buckets with s3cmd ls, for example, or with python boto3 framework