No Madgod, that's not how the real life works. I dunno what's your professional level / grade, but it's not by chance that experienced ones are your "n+1".
In a situation, you'll find by your mathematics that "A better than B". Would you still say that to Mr.X, 10 years experiments if it tells you to do B because it's better for many reasons you don't see because of your weak experiments ? If yes, there is a reason why you're still beginner (I'm not telling you you are of course, just in a case of situation). Learning from other experiments is a part of Neuro-Linguistic Programming tool to improve many things.
Many of you would be under my technical lead in a computing environement, and yet I would'nt argue with numbers (but fact yes, you are right. I would explain a situation where it happens / the causes and, more importantly the CONSEQUENCES (risks) when telling you to do B instead of A.
Risk is what destroy maths.
Cause probability to happen Risk Result
A C1 [0-9] / 10 (or [0-1[) [0-9]/10 Risk * probability to happen
This is how you do a risk analysis, and belive me, if result is higher with A just because of "Risk" value, you'll do B whatever math tell you.
In a raid context, suppose many tries, where people are tired ... the last try, everyone do right, they play well ! And ... the "probability to happen" comes true this try... "ho shit, with (for example) mastery / stam I would have survived". Mates will "hate" you, for sure
(gently).
There is a reason why many BrM from top guild are wearing mastery / stamina. As far as I'm concerned, on Empress for example, I'm starting the adds with FB and not EB at 9 stacks at most (even both !), because it's a "reliable" source of controling input damage where the input CAN be deadly. That is experiment, not maths. I died once (first try), I decided then to be more "reliable" to my mates => stam / all reducing damage CD first, then probability CD (what you do if you don't avoid all hits from 4 adds ? he, you hit the floor even with EB up ... !) and stays stationary to do more DPS (which make you stay alive longer in fact). Not had to wear mastery yet, but stam HOOO YESS.
Just please consider what Gynshon and other are telling you. Numbers act as an "intellectual proof" for sure, but experiment sometimes more, that is how real life is.