Basing your argument on "ratings" is like saying how fast a new car can go based on the highest number on it's speedometer. Some cars will barely hit 75% of the speedometer total, others will bury the needle. All will get you where you're going at safe speeds.
I think the point folks are trying to make is generally...
For sure, some cars will perform safer at dangerously high speeds than others. However, most drivers (listeners) don't need to drive at dangerous speeds (dangerous listening levels) so thier non-sports car (most competently designed amps) will do fine for thier purposes.
