I would have to disagree with you on this some. You state do not worry about the polymer frame, yet a buddy warped his by installing his Timney trigger. Now - I would agree that he could have done it with more attention and detail, but he lost 4 pins by just "doing it enough". Finally, he got annoyed and gave the set screws an extra turn too much. This warped the frame and you can see screw protruding through plastic frame.
What I did on mine was tighten the screws so there was firm pressure and then installed the KNS pins to prevent them from falling out.
Before getting the KNS pins, I did tighten the set screws to support the pins. Yet, I did not use Loctite. After about 400 full-auto rounds through the 15-22, I lost a pin on the range. Thats what prompted me to buy the KNS pins. Cheap insurance and has safed me a bunch of potential issues.
Mike