It's all about dynamics and the extra headroom, not about smashing windows or damaging your hearing.
Few people realize that 10dB is 10x power, 20dB is 100x. If you are listening to a good recording with a 20dB peak-to-average ratio, at an average power of only 10W the peaks would demand 1,000W to come out clean. Jazz and classical pieces are with the highest dynamics, and that's where it makes a big difference.
@howiebrou: I'd be really interested to know your first impressions from the brief experience at the HK AV Show, or anyone else, who was there. Feel free to share what you did not like too, as it would help me make a beter product.
