The OP has just been presented with the reality that opinions vary widely on this subject. And, there are a ton of variables to consider -- the speakers involved, their sensitivity and the load they present; the listener's desired volume; the size of the room being used; the performance capabilities of the amp involved; and so on.
For my two systems, I've found that I don't need a lot of power. I use a 20 watt/ch Aegir in my main system that I prefer to the much higher power amps I previously had. In my sunroom system, I'm using a 10 watt/ch Gjallarhorn. Both sound wonderful and provide all the volume I desire with no sign of stress or lack of dynamics. And, no, I do not have high sensitivity speakers. But I'm also not a headbanger when it comes to volume.
We circle round to the main point -- figure out what you enjoy and go with it. Attempting to impress others or change their minds results in meaningless debate and frustration, both a waste of your time.