Not sure on what you are basing this view of Aus6. In 1992 the US Navy carried out evaluation tests of several knives from every major US knife company, which included the following tests: Tip breaking strengths, blade breaking toughness, sharpness and edge retention, handle twist off limits, two week salt water emersion tests, gasoline and acetylene torch resistance, chopping, hammering, prying, penetration, cutting of 6 different types of rope and nylon line, low noise and reflectivity evaluation, plus an intense hands-on competition in the field. The SOG 2000, a knife manufactured by the same Kinryu Factory in Seki as the subject Parker knife using Aus6 was ranked the highest of the entries.
Al Mar's SERE survival knives also made in Seki but by G.Sakai in the 1980s were made in Aus6. It's very easy to look down on the widely used steels of decades ago today with the benefit of "super steels" we now have, but they were top of the line back then and fulfilled their purpose satisfactorily. Aus6 is totally trustworthy as a blade material for a "survival knife" which relies on far more characteristics to be a good "survival knife" than just the steel type. Today we have far more options and steel choices and I doubt any of us would choose a 30-40 year old vintage knife as our "survival knife". But to say that an Aus6 knife is good only for a decoration is, quite frankly, in my opinion ridiculous.