The problem lies in the fact that (unlike the 1911 census), the 1921 census was conducted under the 1920 Census Act. This Act is still in force, and, unfortunately for family historians, it contains a statutory prohibition on disclosure. I do agree that for those of us who would like to fill in gaps in the stories, seeing the 1921 census would have been wonderful. However, there is now a plethora of information including occupation records, school records and electroal rolls, etc. etc., which will have to do instead.