Let’s take an ability and do some math
Ability - exploding palm - impending doom - 6305% weapon dmg
Now let's add some stats (excluding %elite damage for now)
Main stat = 9000
Crit chance = 45%
Crit dmg =375%
Elemental dmg = 60%
Skill bonus dmg = 0%
Dmg buffs (passives/auras) = 120% (taeguk 60 stacks, determination, relentless assault, momentum)
Weapon dmg = 2500 - 3800
So with these stats our damage is around these numbers
Average actual hit = 198,806,107
Actual non crit = 63,617,954
Actual crit hit = 333,994,260
Ok well what if we had 30% increased palm damage from gear
Average actual hit = 258,447,939
Actual non crit = 82,703,340
Actual crit hit = 434,192,538
Big numbers right? Well at a certain point damage is not everything, but when is that? Can we quantify when we should be putting damage on the back foot and going for more defenses?
Ok now let’s say we add another 20% damage from strongarm bracers as you are using Cyclone strike to group mobs for EP
Average actual hit = 281,943,207
Actual non crit = 90,221,826
Actual crit hit = 473,664,587
So you think you got +20% damage? Wrong, in fact you only gained ~9.1% damage. Was it worth it? Yea ~40mil extra damage per palm is really nice, if you kill the target to explode it. But I bring you back to my point, when should we get more defenses rather than relying on damage to kill the mob before it kills you.
Actual Dmg Gains
20% = 20%
40% = 16.7%
60% = 14.3%
80% = 12.5%
100% = 11.1%
120% = 10%
140% = 9.1%
160% = 8.3%
Ok so let's replace a passive. Let’s take out determination and switch it to near death experience. Now we have a mechanic to help us push forward in A GR and compensate for "HOLY CRAP, jailer just one shot me". As far as that 20% damage gain passive, infinite upgrading Taeguk will compensate for that. Now switch out relentless assault for beacon of ytar, we can gain the damage back with taeguk and gain 20% cdr, sounds amazing to me I love cdr.
All in all taeguk will be the best dps gem as in it allows for you to swap out dmg gain passives for defense passives or utility passives. Ok, I understand that it will take quite a few upgrades to get to that point. But, being able to have 1 gem compensate for 4+ passive damage gain abilities is something I just cannot go without. No longer am I bound to specific passives because I NEED damage. At the same time this can be said for activated abilities as well. With taeguk scaling infinitely it will replace basically all +damage abilities be them passive or active. What is the point you ask, I will tell you, no longer are you pigeon hold into a build that requires damage amp abilities. Maybe you go 2 offense spells and 3 defense spells, maybe the other way.
But wait there’s more!
Getting 60 stacks on Taeguk also means 60% armor (essentially free defense stats).
I have not done any toughness math as I my free time is almost nil, sorry.
TL; DR Taeguk gem best DPS gem in game IF you can keep stacks up.