How to recover the unused column

According to the spec, 'set unused' does not actually remove the target columns and the column data remains in the table's rows. but if a column was marked as unused, there are no any access to the column. then why the clause is released?is it better than drop column?if the unused columns exist still,why there are no clause to restore it?

http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:2913496610745#2914947431112

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