Benefits of Low Qrr MOSFETs in switching applications

In AC-DC and DC-DC power supply applications, designers often choose MOSFETs with low RDS(on) and low switching losses (Qgtot & Qgd) to give the required efficiency.
In this video  Mike Becker discusses a less understood datasheet parameter Qrr, and explains how high Qrr can result in a high voltage spike, ringing & resonance which contribute to EMI emissions, and also reduced efficiency.