I'm of the opinion that reacting to criticism by "deleting everything then retreating to a forum you have complete control over" is unbelievably childish and pretty much proves critics right, but whatever. Evidently people on IV don't agree with haste stacking either.
I'm not a math whiz. So I don't do math and leave it to people who are good at it. I just play the game, pretty decently, and go with what obviously works and is proven to work, and what makes sense when considering how the stats interact with one another and various skills. 14242 -> mastery is proven to work and more or less all of the top parses for just about every boss used it or some variant of "mastery -> haste" below 15k. I'm sure stacking 19k+ haste and multidotting with NT will produce decent results on protectors and galakras, but if you're playing frost and multidotting 3+ targets with NT, you should be asking yourself why you're not playing arcane where multidotting NT will produce numbers far higher than anything frost can even played perfectly.