Your AMR sim there has a 15% variation on the fight length which is a bit sketchy when you're comparing 1:1 with a log anyway..
The AMR sim also had 2 more Lock and Load procs, yet it had fewer Aimed Shots (when each Lock and Load proc is 2 free Aimeds), and with Mythic Goroth naturally having more mechanics to do than the Heroic one, we're looking at an almost 10% discrepancy in Aimed Shot count alone (which far trumps anything else in terms of importance, but yes, everything else looks almost completely similar).
Here is the report (log enabled):
https://www.askmrrobot.com/wow/simul...555b7878fc83f4
Here is the Sisters parse I compared it to:
https://www.warcraftlogs.com/reports...pe=damage-done
Here's a timestamped video of it, just to show that it was not what you'd call a target dummy parse:
https://youtu.be/O1iYEBlGm6A?t=291
Here's a SimCraft run of that exact fight length:
https://www.raidbots.com/reports/eTU...4ci/index.html
Myself and SimCraft are roughly equal in terms of output. AMR is 5% behind despite the additional Trueshot (surprising as they are closer on Goroth).
Why it's so close on Goroth but a huge discrepancy on Goroth HC vs my Sisters parse (where the Trueshot thing + the fact that Sisters is much more heavy movement are both big players "against" AMR), I am not sure, but as far as I can tell the reason SimC beats AMR more often than not is that it optimizes T20 2pc handling better, something my Hunter guide puts big emphasis on when teaching the rotation and one of the cornerstones of playing MM well. I don't know if it was intentionally programmed to be a bit worse than 100% optimal to be closer to "highly skilled human" than ""robot"".
Don't get me wrong, being within 5% of SimCraft which is one of the stronger modules is not bad at all, but when we're talking such fine margins between gear pieces already it's not something I could recommend on the basis that "well AMR is closer to what real humans do". SimCraft just has a better APL than AMR, and maybe "highly skilled human players" are somewhere in between, or closer to SimCraft, or closer to AMR depending on the colour of their socks and what they had for breakfast that day.