I generally agree, but the thing that's left unsaid I think is that most users don't read content even when they vote individually. Both group voting and single voting doesn't assure quality, you'd have to take the additional step of actually reading the post. And even that's no guarantee!

It's basically like voting in real life! You may vote what your "group" tells you, what your party tells you, what your dad tells you, or what you tell yourself, but at the end of the day, none of that is going to be any good if you're not educated. They say for democracy to work, you need an educated populace, and I think the same is true for steemit.