I too have noticed this new type of stopping technique. It used to be that the officer would place his hood ornament roughly in line with the offender's driver's side tail lights, thus giving him/her a better view of the suspect and their vehicle. But I too have seen too many police videos where some idiot crashed into the cruiser and wounded or killed the LEO.
InMiddleburg Hts, Ohio, a local LEO had a driver stopped on I-71 and they were near the end of an entrance ramp. The officer was at the side of the suspect's car doing his duty, when another guy in a truck, for whatever reason, veered across 3 lanes of rush hour traffic and slammed the LEO's cruiser. The patrol car lurched forward and pinned the officer between his own cruiser and the stopped vehicle. He lost a leg, and his career. It was a terrible instance of a driver's inattention, that in turn caused a terrible tragedy. My guess is that maybe the 'angle stop' technique is hopefully meant to deflect another oncoming idiot with the LEO's cruiser, and therefore reducing the risk. I hope it works, their job is dangerous enough.