Why are there no recent illustrative quotations for many words in common use?
If an entry goes back to the first edition of the OED (1884-1928) the quotation evidence will reflect the material available to the editors at the time of writing, and can be surprisingly close to the date of publication. Extra evidence was added to some entries during work on the OED Supplement (published 1972-86), but many entries written for the Supplement are now also in need of updating. As we revise the text we always add later evidence when it is available. If it is not, we may need to consider adding an Obsolete label. We do this when we have failed to find usage evidence later than 1900. Contributors have been sending us postdatings for over a century now, and all this material is in our files ready for use by the revisers.