In my experience not all the top players theory craft, it's been 2-3 a group who do lots and poke the others enough that they'll do some research.
Given the path of least resistance is to find a BiS List they'll use that.
Very rarely did they run sims themselves based on their characters. This was a few years ago as I'm a lot more casual now, however I'd be really surprised if that part has changed. I've just joined a new, more serious, guild and one of the officers asked all the raiders to go and look at raidbots. So it doesn't seem to have changed.
Either way it doesn't matter, you're free to use whatever you'd like. The results from AMR don't force you to use them.
Zoopercat spends a lot of time comparing log results to the sim results. Did you read her blog post about comparing them?
There would have been many, many hours put into that. You could just read the warrior bit but that might leave you with questions which the first part answers.
Have you looked through the rotation and the trinket data to see if there's a problem?
If there is I'm sure the team here would like to know, they actively look for bugs but there are a lot of things on their plates.
The other day on the Discord server there was a great conversation between one of the mage theory crafters and @Swol. I think it was one of the people who maintain the mage part of SimC. He was doing a comparison of the mage changes between the two sims to see if there were any errors in either.
I commented at the time that it was great to see.
It would be nice if all of the class/spec TC's had the same attitude but that isn't how its worked out.