Wisdom!
This is the best solution by far. It keeps your hands relaxed and will save you muscle strain and efforts and pains.
But… it’s hard to rock out this way. So if you’re into huge, energetic musics, stage antics and the physicality of playing, this will be hard to maintain (said the guy who is into huge, energetic musics and the physicality of playing… and volume).
This is too hard for most things… but Flea makes it sound awesome. If you want to be aggressive, this is a useful thing to bust out. But - yes - ideally the amp is working harder and you can relax your plucking hand to get nice even smooth sounds from your strings.