The 5V5A supply is optional, the Pi 5 alone works perfectly fine using a standard 5V3A USB-PD supply, it just limits the maximum combined USB port current to 600mA.
But technically they are still in USB-PD spec: it’s apparently okay for a charger to support 5V5A, and a device to “prefer” to use that if it’s available. It can’t be required, but as said, the Pi 5 works with 5V3A, so it isn’t.
It’s still dumb, and they should have just used 9V3A instead and paid the dollar for the stepdown circuitry like everyone else.
The 5V5A supply is optional, the Pi 5 alone works perfectly fine using a standard 5V3A USB-PD supply, it just limits the maximum combined USB port current to 600mA.
But technically they are still in USB-PD spec: it’s apparently okay for a charger to support 5V5A, and a device to “prefer” to use that if it’s available. It can’t be required, but as said, the Pi 5 works with 5V3A, so it isn’t.
It’s still dumb, and they should have just used 9V3A instead and paid the dollar for the stepdown circuitry like everyone else.