OK, so everyone's well aware that Paul Heaver's won three back-to-back World Championships, and with a different list each time. But have you noticed one of the things all his lists have in common? They're all four ship builds.
We've seen two and three ship builds popular for quite some time now - Double YTs, Whisper/Chiraneau, Dash/Corran, Brobots, the Palpmobile Aces and more. Quality can clearly outperform quantity... but there's safety in numbers as well. The more ships you take, the less badly you're hit should you lose one, and the harder it is for your opponent to decide on target priority.
There's clearly room for both quality and quantity in competitive builds - but where to strike the balance? Four ships, maybe?