Is Glock aiming at cutting costs recently?
I don't know, but the testimonial evidence is that the Gen 4 Glocks have derailed Glock's stellar reputation for total out-of-the-box reliability, extending even to the late model Gen 3 products.
Gaston Glock is getting up there in age and perhaps has allowed others without his attention to important factors to supplant his decision-making process. Just sayin' ...
One thing's for sure, I'm certainly happy with my 2007 Glock that is the only firearm I own that has been absolutely perfect since Day One with every FMJ and JHP ammo put through it.