why can't magic pen scale like lethality does?

start slower and ramp to normal value i buy serrated dirk 10 lethality (starts with 7 armor ignored) 70 % efficiency if bought early yet the mage i am versing buys {{item:3020}} and has instant 18 magic pen why is this they way it is no wonder mages are considered overpowered there is no scalling related to them
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