Recent Logic: AD is useless, people just build armor; AP is useless, people just build MR, etc.

Using the logic that lethality makes armor useless, let's all just stop building anything because everything is countered by something.

AP < MR AD < Armor MR < magic pen lifesteal < grievous wounds Armor < armor pen attack speed < FH/randuin's crit < randuin's health < LDR/Liandry's/botrk movement speed < frozen mallet/iceborn/rylai's CC < tenacity/qss/banshee's veil/edge of night slows < boots of swiftness traps < control wards burst < health split pushing < banner/zz'rot

No matter who someone is playing as or what their build is, there is an item that can counter them or at least lessen their effectiveness.