Sodium Thiosulfate fixer

I just read in "The Film Developing Cookbook" the following: "The most current research indicates that sodium thoisulfate, the photographer's standby for most of the 20th century, cannot adequately fix modern films or papers. This appears to be due to the increased use of iodide in contemporary films and papers. If an acid fixer is to be used, use only acid 'rapid' fixers based on ammonium thiosulfate". As I have been using the methods recommended in AA's "The Negative" and "The Print" for some time now, this has me concerned about the archival quality of my processing. Any comments?

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