User blog comment:Rezardmaw/Bloodrazor proposed change/@comment-24795478-20160515133943/@comment-27722295-20160515201617

I actually did some math with lvl 18 Kog'maw with no AS rune and only Blade of the Ruined King, to compare 45% bonus AS and 15% total AS. Yes 15% total AS is worse at that point, consider Kog'maw Base Attack Speed is only 0.625. I don't add up 0.02 Base Attack Speed Modifier.

The point is to discourage : this one and only damage item and the rest is tanky items. A champ must have some sort AS steroids or buy at least 2 attack speed items which make them squishier for 15% Total Attack Speed to surpass 45% Bonus Attack Speed.