Here's the real kick in the nuts that IME does compared to BMC or other 'Management ports'.

(1) It is not something that you can (easily) disable

(2) It uses the same Network port that your LAN NIC uses instead of a separate "I won't plug that in if I don't want it" NIC.

(3) Security/Patches? This is outside the control of the BIOS manufacturer, so how do you make sure it's patched and upto date? and

(4) It wasn't an option.