Steel of the week? If you think M390, S90V, etc are short-lived fads, you're seriously out of touch with the non-traditional knife industry.
If Benchmade wanted to make a true traditional (like you suggested), they should have used a carbon steel. Instead, they used a steel that comprises the absolute majority of their product line, which makes it completely homogenized with the rest of their knives, minus the lack of a lock. I'd be interested in a traditional from BM that had 52100 or K390 so it could patina a bit and hold a low-angle convex bevel.
It reminds me of how GM would put that 3.8L V6 into every car they made. You could argue that it wasn't a bad engine, but an Impala, Camaro, Regal, Grand Am, Grand Prix, etc all had the same engine, which made a lot of enthusiasts shrug their shoulders and look elsewhere.