That's because 18/21 isn't an agility build. It just has 3 points more agility, it's a balanced build. You don't become an agility build until you've got at least 24 agility and to be an agi whore you need at least 27.
What's the difference at that level? Actually it's quite dramatic.
18:21 Is an agility-biased balanced build. Balanced to a degree, but still biased none-the-less. So before you start shooting statistics out, atleast be specific.
I thought other non-PK members would know simple Mount & Maths. How wrong I was. Really though a balanced build would have the same attribute count on either stat. That's how balance works.
If you're that un-PK, and need it
really dumbed down I'll provide an example that PK's use to talk to the greater (lesser on the skill perspective) community, who are completely dumbfounded by our theories and Mount & Science, and godly skill levels.
So here goes, you can read it more than once if necessary (I understand if it is for a lowly non-PK):
• Get a see-saw mechanism.
• Put 19 potatoes on each side, one side being strength, the other being agility (for this build, there's an odd number, so you can be one of the potatoes, and vegetate on a side of your choosing, because that's what non-PK's do; vegetate)
• Observe the balance, a 50:50 (or close to) weight distribution or 180 degree line on the axis of the seesaw.
Now, factor in your so-called, "18:21 ... Balanced" build, and I can assure you, the axis will not be even.
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Lecture over.
I'm still surprised you don't know first year Mount & Maths, I learned that when I was younger and less experienced (but still globally the best),
By: IncrediblySkillful, the best there is.