Alan Shaw also says higher power is always better and also it is better to have high power amps to get best out of the speaker.
Yes, that is why I asked you (in my earlier post) if you are in need of more power. His thought is based on the simple physics and nothing to do with Harbeths - More the power, better the dynamics. Again, he also states the power requirement based on your listening habit and the type of music you hear.