Talk:VPBE/@comment-24951773-20161030080155/@comment-1330314-20161030082415

Yes, it's technically worse armor pen, numerically speaking, and while I personally support the removal of all flat pen, I don't think percent armor pen would be appropriate for assassins.

The advantage Lethality has over current armor pen is that the stat scales with enemy level -- effectively, it offers a degree of protection against falling off when behind, because you can still scale even as your opponent gets a lead. Its core function, though, is to make killing squishies easier. By contrast, percent penetration -- especially bonus armor pen -- is most effective against tanky targets, which is why it's a staple on marksmen. Giving assassins that kind of bonus would, at best, not be the most desirable stat for them, as it would be minimally effective on squishies, and at worst would make them better at killing tanky opponents, which would suck, as tanks and fighters are meant to counter assassins.