Not a good sign
Using American Megatrends BIOS is a sure sign someone is cutting corners (& costs).
15 publicly visible posts • joined 15 Oct 2017
I tested the "problem" on my Mac (High Sierra) and .... NO root access using blank password.
Again, trying to elevate my privileges (as described) from System Preferences - again NO root access.
Granted Apple has rapidly pushed out a patch means it was a problem but ... not everywhere.
Not denying it hasn't been witnessed - just not on EVERY machine.
So relax from RANTING and foaming - please test your sources BEFORE jumping on the gloat / hate wagon.