Fatigue state drilling can be incredibly effective when done correctly. Some rules I use are:
1. Do not introduce new skills when fatigued.
2. Be aware of technical breakdown and cease reps once form is compromised.
3. No crazy shit unless you're in the market for a blown ACL.
Damn!!! Really good stuff here! Fatigue state drilling is excellent. I swear by it. But so many meatheads do it sooooo wrong and get mass reps with shit form. They just down understand skill work and technique acquisition.