The thing to keep in mind about the AMR is that anything "on the AMR" is actually on the board.
The AMR itself is just the physical ports - all the logic is provided onboard.
As far as Firewire goes - I've needed it once... ever... in my entire life. If I ever want Firewire with my AmigaOne I'll get a PCI Firewire card from my local dealership. I'd hate to pay extra for my board to have something so non-essential on it.
The onboard stuff on the AmigaOne is all USEFUL (admittedly, you may not use the modem if like me, you have cable, but because of chip choice, the modem is pretty much a freebie anyway)
Regards,
Ben de Waal
AKA YttriumOx