Well, it's only 8 mobility drills... lol. Doesn't Joe DeFranco have something called the Elite 8 or something as his warm-up? It takes less than 10 minutes, regardless.
As for warming up with squats and stuff... I get it, and some people are lucky in that they don't get injured or anything. As for me, I've been to the PT/chiro way too many times for way too many injuries, and they often find I have some kind of mobility/strength deficit that could have been fixed by a proper warm-up. The older I get the more important this mobility stuff becomes.