I never understood why anyone would flex their elbows during a deadlift. It might have been someone's brainfart idea to get an isometric bicep contraction while deadlifting, lol. Just relax your elbow, like you said.
The point about bicep curls and partial pullups is interesting. Maybe that's why most people in commercial gyms don't deadlift….it screws up their bicep curling, LOL.
The strength trainee says "Why sacrifice intensity when I can sacrifice volume"
The bodybuilder says "Why sacrifice intensity when I can sacrifice form"
"We are not sport, when there is a sport issue, we are not so good. The boxer is much better than us at boxing. But he will have to protect his balls if he wants to punch us."