Have you ever used a NOS that wasn't already broken in?
Most of mine are brand-new, straight out of the box.
They are definitely stiffer than the worn in ones I have, but still feel significantly softer to me than my T-stiks.
Again, mine are leafsticks, but I can't imagine that microswitches vs. leafswitches would have a terribly noticable effect on the stiffness of the stick--unless they switched to a stouter grommet at the same time that they went to microswitches, with the intention of making the stick stiffer.
I don't think I have any microswitch ones around.
If I bump into one in one of my boxes sometime, I'll mount it, and see if there's a difference.