The title is someone else's comment. This is the reply.

No, because autoattacks scale multiplicatively with 4 stats, vs 3 for spells. That extra stat (crit chance) makes a huge difference, even with much less AD than AP.

Simple example: 4x4x4=64, while 3x3x3x3=81.

Most math is in quote boxes, for easy skimming.

What would happen if AP scaled like AD?

To find out, let's add a stat called SpellBoost (SB). 100% SB -> double magic damage.

Then take a ziggs full build, and make it scale like this:

120 AP, +35% AP => 80 AP, 30% SB 100 AP => 40% SB 100 AP => 80 AP, 30% SB 80 AP => 50 AP 70 AP => 50 AP

I basically took the AP levels down to the AD equivalents and gave SB equal to 1.5x the crit (to make up for IE's passive).

Full build: 635 AP => 260 AP and 100% SB

Not impressed? Let's check the damage

A rank 5 Ziggs Q does (255 + 65% AP)

On live, we've got 255 + (.65 x 635) = 668 With the changes, it's (255 + (.65 x 260)) x 2 = 848

The new build does 25% more damage with less than half the AP.

That is the power of hyper-scaling.