OK I see. I think their are a lot of biners to chose from. Use the right biner for the right occasion. Scew types are great until you belay with them the wrong way and the rope unscews it. Or in the case you present in your vid. impact does it. Like the saying gos dont put the right tree in the wrong spot .well dont use the right biner for the wrong situation. Pay attention to where your gate is and what it takes to open it and you'll be fine(Always face gates toward you or away from impact) making something idiot proof now days can be tuff. 1,000 of people are serously injured every year from falling off toilets!!!!.
Keeping people safe in trees is verbal, constructive, critsizem. You guys are doing the right thing and that is talk it out. What works....what doesnt...and why
Stay safe gentlemen