Yes there may well be a small number of law firm articles which do not have a complete list of offices, but the overwhelming majority do, as you will have no doubt have discovered yourself in your search. I don't believe that we should base our editing decisions on the quality (or lack thereof) of the Haynes and Boone PR office, who arguably should not have been editing that article in the first place anyhow.

 My firm belief is that details of the office locations of a law firm are essential to properly understanding that firm. If a firm has ten offices in the United States it could have ten offices in Kansas, ten offices in California, ten offices in New York or ten offices spread across Los Angeles, New York, Chicago, San Fransico, Dallas, Washington etc. In each case it would be a very different firm. 

 The same is true of the UK. Leeds, Birmingham, Manchester and London are all very different legal markets, and are all very different again from Croydon, Oxford, Norwich or Brighton. The location of the offices is very important in understanding the market that the firm is operating in - in my view it is as important as the number of lawyers, the turnover of the firm and the profits per partner.

 Again, I completely accept that at a certain point it becomes impractical to list all of a firm's offices in their Wikipedia article. That is clearly the case for PwC, with over 750 offices. I personally do not feel that 69 offices is an excessively large number to detail however, and the revised format of the list now takes up only a few lines in the article.

 Please consider that you are seeking to reduce the sum total of information available to Wikipedia readers. How do readers benefit from the deletion of this information? I can't see any way in which they do. And how do they gain? Again, I can't see any way in which they do. The information is correct, is cited and is factual. It helps readers' understanding of the firm. It is no more advertising than the article of a car manufacturer giving details of the cars that it makes.

 I appreciate that I am outnumbered in this particular discussion but do feel strongly that as a point of principal law firm articles should be allowed to have details of office locations, and that to not allow this would be to single out law firms and treat them differently to many other commerical organisations on wikipedia where far more extensive details of their products and services are allowed. The number of articles, replete with attractive photos and impressive performance details of BMW cars is for example very large: List of BMW vehicles. I have no particular problem with this, but wonder why law firms in general, and this law firm in particular, are being singled out for so much harsher treatment here.