Patch Available - KMST 1.2.14

Very dumb to still have %damage around, especially when %attack is superior to %boss at high funding levels. They really need to clean this part of the damage formula up, or at least change damage to %attack.
Hadriel

I never understood the fetishization of %ATK at high funding levels. The math doesn't work out at all.
If we assume a class has a tier 3 Emblem, and 1 line of %ATK anywhere on all 3 pieces (so 36% ATT, ideally on bonus potential), most classes will be oversaturated with %ATK.

Until you have 233+% Boss and %Total, you shouldn't even consider a 12% ATT line.
Once you have 36% ATT, an extra 12% ATT line is only an 8.8% increase.
%Boss + %Total is only worse after 355%. Now, assuming you're godly and you get 21% ATT on bonus potential on all 3 pieces => 63% ATT.
%Total + %Boss is only worse after 443%. There are very few classes that can achieve this (probably just Xenon), even if we remove all of the easy places to get some of this %Total + %Boss. 60% RA, 30% Gollux, 15% DS, 50% Boss nebs, 20% Kanna + DA, 9% boss on 3 S decks, 7% BT link. 191% boss + %Total.
Where do people get 252% Boss + %Total from? 40/40/30 40/40/30 on regular potentials on Weapon/Secondary? Nope, still need more.
Also, most people cube for %ATT or at least land 1% ATT line on regular potential (so 40/40/9% at most), making the equation even more lopsided. Your emblem is probably 70% PDR and 9% ATT ideally, making yourself need 473% Boss + %Total to balance it out. Another 30% more impossible to get %Boss and Total.

I will argue for nearly all classes at endgame with the lopsided setup I mentioned above, a 65% Total damage + %Boss modifier is probably better than 21% ATT.