There are a couple of ways you could look at it...
The simple way is that if you have a dual pivot on the front, of pretty much any variety, then you have enough brake to lock up both wheels (it'd have to be a truly execrable unit to fail that test on the rear), and as long as you can hold the back wheel just off the ground in an emergency stop, you have all the modulation you need.
The other way is that when it comes to brakes, it's easy to justify a standard of excellence.