My apologies Kees. My feelings were being prompted by life doing tool and die maintenance. The golden age of CPM and like steels changed the industry for the better.
For instance, I built and maintained dies that formed the staple pockets in 440 stainless steel. The very small punches in the die were made of cpm steel. The other steels were not able to do this task and that led to non invasive staple guns being held up for many years, in the operating rooms around the world.



I only use those "other", steels in my planes too.