Part of the reason behind it's logic is is considers strength to be nearly worthless to us and it really is
Not really. Not as valuable as haste or mastery, sure, but more valuable than parry or dodge, which themselves aren't worth nothing.
04/27/2013 02:17 PM300stamina from a gem (240sta gem+passive bonus125%) is better than 60 str (which is correct).
Posted by Iylia
Though this is probably true, simply because avoidance is worth very little while stamina is not. However the 60 strength isn't why you'd put a hybrid gem in a blue socket; it's because haste/mastery/expertise are worth more than stamina except under specific circumstances (e.g. bosses that hit very, very hard).
Not sure how to explain the changes from a mastery enchant to the stamina stuff
It's because AMR heavily overvalues stamina in its default settings. That's why you pretty much always have to modify the stat weights or ignore all of its non-accuracy suggestions.
(and yes robot will almost always put you a TINY fraction below it because .03 points under is less wasteful than .06 over
It's not always that accurate though. I've had it put me quite a bit under the expertise cap (around 7.2%, I think, as Ret) with the forced caps setting enabled. Sure, I ended up at around 7.68% when I went in and adjusted expertise's weight to 5 manually, but that's far more acceptable to me.