I absolutely agree. 

In a prior post, someone mentioned that their insurance carrier also required a disclaimer. 

I've always preferred to provide an extensive disclosure and notice page(s) to my work.  This is because of the many known flaws in the Grantor-Grantee Indices.  In point of fact, my own parents had a reconveyance mis-indexed on the Indices a few years ago.  I was the one who noticed the flaw and brought it to the attention of the Recorders' staff to fix.  However, this highlights an important point that many people are unaware of in the modern age of digitized, computerized indices;  a mis-indexing of a lien can be corrected with NO public oversight.  A lien that has been entered incorrectly for years on an index might be changed in the computer.  Your research may have cleared the property of encumbrances one day, and the day thereafter, with a corrected index entry, you might have a property on your hands that is "newly" liened. 

I make sure to keep a file of specific examples of indexing errors that can be called up by me at any time to show such flaws both historical and current. 

Perhaps I am splitting hairs, as the difference between my "disclosures" and your "disclaimers" is probably non-existant, but it certainly makes me feel better to have our clients understand something of the methodology of our work and the nature of the records.  I look upon it, not only as a "CYA" move, but also as an opportunity to educate.