I do not really play any stamina builds other then a gankblade that I haven't played in months, so I don't even know if this was a good change or not but the below is a great example of my question.
How exactly do you guys do all of this at one time, and know if it was a good change or not?

1. Stamina abilities are now universally 15% cheaper than their Magicka counterparts, originally being 20% cheaper. (Love the wording.)
2. Wind Walker: This passive ability now reduces the cost of your Stamina abilities by 1/2% per piece of Medium Armor, down from 2/3%.
3. Constitution: Reduced the Magicka and Stamina restored by this passive ability by approximately 42%.
4. Redguard Adrenaline Rush: This passive ability now restores Stamina based on your character level instead of your Max Stamina.(Its a nerf)
5. reduced the fallowing to 15%: Hardy, Elemental Defender, Quick Recovery, Siphoner, Mooncalf, Arcanist, Health, Tenacity, Tumbling, Blessed, Elemental Expert, Mighty
6. Replace Magician passive to Siphoner.
7. Remove Warlord passive
8. Bone Pirate Tatters: Reduced the Stamina Recovery granted by this item set by 50% (150 Stamina Recovery at Gold CP160, down from 300).
9. for the pve off tanks who use it: Reduced the cool down for being charged Stamina or Magicka to block an attack to 0.25 seconds from 0.5 seconds.
10. Finally to do this:
11. Vigor: Increased the cost of this ability and its morphs by approximately 30%.
12. With the dev comment: Vigor was too cheap for an area of effect healing ability, so we’ve increased its cost so there is more of an impact to keeping the heal over time buff active.

Now I'm sure before all of those changes were made vigor may have been OP or maybe not, Im not here to say that.
I'm just wondering with the many of other examples inside the patch notes how do you test all of this and make all of these changes at the same exact time (or expect us to do it for you) within 5 weeks?

But really you don't even need to look at vigor in the list just look at every single one after all the others changes are applied. How do you do it? why do you do it? Is there not a better way? Why do this many changes every 6 months when we could do minor changes/ small tweaks every couple weeks? Why use a sledge hammer when a scalpel may have been sufficient? Why couldnt the cp changes have been dropped on us during homestead and then we could have seen if the rest of the nerfs were needed? Didnt you guys have "thereocrafters" come down to the studio to help with this?
@ZOS_GinaBruno
@ZOS_JessicaFolsom
@ZOS_BrianWheeler

P.S. Why is Stygian still medium even after this? Stygian: This item set no longer increases your Spell Damage and Max Magicka by 20% while sneaking or invisible; instead, it increases your damage done with Magicka abilities by 20% while sneaking or invisible.