The argument that betting your life on a MIM part in a well engineered and properly manufactured firearm is somehow reckless or uninformed is a losing one in my opinion. We all drive automobiles that use MIM components in applications that are absolutely critical to their safe operation. It is a manufacturing process that saves time and money without compromising safety or performance in countless applications.
Now if I buy a part that I believe is made from bar stock based on the manufacturers description and find that it is not, I would want an explanation. It may be the description is deliberately misleading in this situation. That is more of a concern than it being MIM in my view.
"Any fool can criticize, condemn and complain and most fools do." Benjamin Franklin