Old fuff you make good points but you are referring to improperly made MIM parts which can be true of all things made of anything.
True. That's because the chance of getting inferior parts goes up when cost reduction is the primary goal, and the ultimate gun manufacturer buys them from an outside vendor where (probably) the lowest bidder will be the winner.
In and of itself I am not opposed to MIM technology. My greater worry is that to reduce costs it may be used in applications where it shouldn't be. I know of a number of instances in firearms components where this has actually happened. I want my personal handguns - especially those that I depend on to protect myself - to be made with unquestionably proven methods and materials not rooted in saving production or labor costs. That, and in many cases I can buy what I want for less money then a potentially inferior new one costs.