It is FAR easier to sell something on more-is-better because that is easy to understand. If the extra power does not come at an expense in terms of sound quality, that would mean no harm in having way too much power in reserve. But, that is not really the case. Of curse it is a matter of taste, but, I generally prefer the sound of low-powered tube amps over other types. Often, my least favorite amps are high-powered tube amps running multiple KT88, KT150, KT170, etc. tubes (the sound is "hard" and harsh sounding to me). These days, most good solid state amps are smooth and not harsh sounding at all, but, they tend to sound a bit lifeless and unengaging unless the volume is push up higher than one would play the speakers running good tube amps.
I know Harbeth advocates for a lot of power and their speakers are somewhat inefficient, but, the best I have heard them sound was with medium powered amps. A good 20-100 watt pushpull tube amp would be my choice.