I don't think there a has been a lot of failures with the the plastic parts in the T-3.
It is probably just an inherent mistrust in plastic rifle parts to those of us old enough to have grown up in a world with no cell phones, personal computers, or plastic car bumpers..
Firearms are one of the very few consumer products we buy which most of us expect to last for several lifetimes if treated properly. Somehow plastics - no matter how advanced - are still perceived by some of us as having a limited life span even if not prone to out-right breakage.