As far as I've read, the Portico's have a "lap top" type power supply. I'm a little sceptical about that too.
This, imo, is one of the big advantages of the Portico range. The power supply is a seperate 12V DC power supply.
These things are designed to fit into racks and expand anyway you want to go. It would be crazy to have built-in power supplies for each module in a large component system. Most of the real high end preamps have seperate power supplies, that are far more exotic that 12V DC. (Fancy trying to find a power supply for a Chandler in a hurry???)
You can run Portico stuff off a car battery! Or any 12V DC source with enough current! That means you don't have to worry about the power supply failing in the future - you will always have plenty of cheap off-the-shelf options to keep you running. Or go mobile with a battery.
Keeping the power supply external decreases noise and heat. These class A style suckers make enough heat as it is - they are the real deal.
Obviously external power supplies also keep the size, weight and cost down.
It's a good thing.
The lap-top style PSU is a switching power supply. These are way superior to transformer-based PSU, that can radiate hum for mile and catch fire when left unattended.