The AMT has its uses as well: wiki link.
On a tangental remark, I completely “bricked” my 2013 Macbook Pro but was able to still get it booted back into OS X. I’m pretty sure that Apple has a hidden, untouchable recover disk within my system, making my operating system not the sole partition within the system. I’m not too familiar with this kind of stuff, but I do remember that back maybe five years ago you could completely wipe a hard drive and it wouldn’t have any recovery mechanisms in place like I have on my Macbook Pro.
On newer Macs, you can install OS X from the internet with a UEFI payload in firmware.
“UEFI payload in firmware” was the bit that I wasn’t sure on. Thank you for clarifying.