i dont understand why someone would want to do movements requiring less effort before a large compound movement like bp. i personally do my hard lifts first (squat, dead bp) because they are the core of my routine and recruit the most muscle. follow up with what ever simple movements after the big ones.
Willdebeast, the whole idea is to make it harder for the chest when you do the compound movement. This way your triceps find the movement quite easy since you are using a lighter weight, and therefore "working the chest harder." That is the idea behind pre-exaustion.
I haven't practiced it myself, partly ego I'm sure.