This is why tanking is a joke
Just played Trundle top with full defensive masteries including all the armour masteries. Full flat armour yellows. I had 58 armour at level 1... Oh and i should point out that i'm stealing AD with my Q which lowers every single ability of hers and it still doesn't matter.
Vs. a Riven with no penetration items built the entire lane phase.
I rushed Warden's Mail, Doran's Shield and Tabi with Cloth Armour start.
She absolutely destroyed every single trade without any effort and killed me in a few seconds, with no penetration items. While having mass mobility and CC. She didn't build a single pen item until 20 minutes in and still trashed a 150+ armour Udyr and Trundle in every single 1v1.
Seriously....

full tank 0-30-0 masteries with health quints, armor seals, and MR glyphs in aram with a giants belt first item, got bursted in less than 2 seconds by a talon with both of us at lv3. no one should be able to burst down a full on tank. that should not happen.
, not just on pure armor/HP/magic resist. Just saying