Too many people are entranced by the latest and greatest. The older steels are known quantities when it comes to plentiful supply at decent prices, heat treating, and solid performance. Newer steels might be better, but at what cost to the manufacturer having to start the learning curve on a new steel and another new steel and another new steel? When the 154CM performs so well, it's vanity alone that would play with anything else.
Of course there are companies like Kershaw and Spyderco that do very well with a multiplicity of steels and new designs. Emerson is in the business of making a different sort of knife, and he does it very well. But since his business model doesn't track someone's favorite other company's, someone will feel Emerson is "wrong". That's narrow-minded, short-sighted, and probably due to lack of experience with the Emerson (or Strider or other knives) being criticized.
One thing I value in the Emerson model is the stability of the same steel and the same G-10 with liners and the same liner lock. That means when I get a new Emerson, the difference is in the new design alone, and I can work out the advantages of it without having to factor in materials and technology. These knives are for using, not showing off.
(Got a CQC12 framelock, can't complain about those differences!

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