[Shin Pad]

Originally Posted by Mass_nerder

I didn't watch the video, but scrolled through it quickly without sound; this doesn't seem like a great strategy.
You're removing the bottom member of the truss that is in tension, so when load is applied, instead of being transferred to that bottom member, it is transferring it to the stud walls, which are designed for compression, but aren't really braced for lateral movement. Basically, the roof is going to push the walls outward, and the only thing holding them together is the end walls.
It's probably technically doable because the roof will never have significant load applied, but it won't be particularly stable.
*edit: I'm not a structural engineer, but I've taken several graduate level structural design courses, so I guess take my advice with a grain of salt*

I agree - you need collar ties.