That was clearly a developer oversight. Look at the other loot from the boss Agni comes off. Use common sense. The same thing happened last year when it was discovered that the Hmal Lance was suddenly the best 2h weapon in the game.
This is clearly a developer oversight, however in the way you cite. The game favors spell damage MUCH more than "white" melee damage. Basically Shimone pointed it out in a rudimentary way. Melee scales linear with a small scalier, where as magic damage is nonlinear. Math omg.
When I was on-tier with agni I parsed it against the other shitty weapons you can get around there and didn't find it to be better.
Fuwok is not incorrect in his statement. Agni drops from a T7 mob in PoFire. Around that time a warrior is likely to wear a Juggernaut for their charm (0% spell crit) unless they are pro and use an open Type 5 aug for a Globe of Searfire for 3% spell crit. They also most likely have 0% fire focus. Not truly receiving one until Diadem of Tarhyl's Anointed from ToT at T9, unless they use Virtue (T8) for some reason.
At Tier 13 a warrior has his Supreme 8% spell crit, can have 8% more spell crit tome Tomes, can have 8% more fire damage from Tome of Flame Mastery, can have 7% more fire damage from Fiery Chaos.
All this time the only things that are helping their white damage (melee) is a laughable amount of strength that developers are still reluctant to tell players how much it actually helps or what it does. and a possible 4% more crit from tomes.
How is it acceptable that there is ONE tome that helps white damage in the game?
Tomes that help Spell damage and or procs?
1 - Manual of Triggered Casting
2 - Tome of Critical Evocation
3 - Tome of the Mind
4 - Tome of Frost Mastery / Tome of Flame Mastery / Tome of Magic Mastery / Tome of Infection Mastery / Tome of Lifetap Mastery
NOTE: All Lifetaps spells in the game are also Magic so they "double dip"
Hmmmm, I really wonder why the HMAL Lance, Lance of Vigilance, is powerful at high end game?!?! It's and Agni with a better ratio and also has a proc that double dips on tomes.
People wonder why melee are low on the DPS charts, its simply because white damage is laughable once you get to the higher end.
Every "good" weapon in the game is only good because of it's proc. Weapons mean nothing without a proc.
It's funny that Experimental Staff of Skycalling hasn't been nerfed yet. Let me guess: I'm sure it was the person who made the weapons fault? They didn't foresee a Tier 3 weapon out parsing a T11 (Nail of Festering Decay) weapon. How could this be?!?! A 0.368 ratio weapon doing more damage than a 1 ratio weapon?!?! You need only look at the proc.
The problem is not the weapons people, it's the math.
1- 150 worn atk cap being stagnate
2- 10% worn melee crit being stagnate
3 - Only having one melee tome in the game (4% more melee crit)
4 - STR and Dex having such little progression that it isn't even parsable.
5 - Tome of Enhanced <Insert Stat Here> being in the game just to take the place of good tomes that increase MAGIC damage that 100% of the DPS classes want to get just because they are the only things that actually increase DPS in the game.
6 - Bane Damage even being in the game (This is a whole different topic and even longer rant that I don't wish to get into at the moment for your sake)
These are the problems people, not the weapons. Stop nerfing items to mask true problems with the game.
Sorry for my long rant. I hope no one ends up reading this. More so I hope no Dev takes this personal that is not, and never will be my intent.