"lethality isnt OP", "build armor against it".. umm you're missing the point..
TLDR:
You want to know why people don't bother buying armor vs lethality? BECAUSE ITS NOT WORTH IT!!! the point of removing damage from out build in order to build armor.. so you DON'T GET 1 SHOT. if we put the armor in and we STILL get one shot.. then what was the point in building it?.
i have 1900 hp.... i dont CARE if u 1 shot me with 2000 or if if you 1 shot me with 2800 or if you one shout me with 20000000 damage.. its still a one shot. and if building armor isnt goign to STOP that "one shot" and i lose offense buy building that armor... why on earth would i build armor?
you are completely missing the point of WHY lethality is OP.
it isn't JUST the values of lethality.. its the ITEMS they get it on

ALL of these items not ONLY give lethality the have a HUGE amount of AD and they can be used with pretty much ANY ad champ and they are are
is 97.13% gold efficient without the active effect and 124.37% gold efficient while using it.
Out of combat,
is 105.4% gold efficient without the active effect and 132.64% gold efficient while using it.
In combat,
is 98.95% gold efficient without its active effect. Out of combat,
is 106.69% gold efficient without its active effect.
is 80.38% gold efficient without its passive effects. Out of combat,
is 87.77% gold efficient without its passive effects.
and while duskblade isnt as gold efficient as the other two.. when u combine it.. and its passive which isn't calculated it becomes VERY strong
at the same time these champs can also get
to counter ap
ALL OF WHICH ARE OFFENSIVE
what do AP get for offensive vs armor?
is 92.73% gold efficient without its active.
and
.
the point is when u build lethality you counter pretty much all the armor in the game stuff while sacrificing NOTHING. you get damage your get effects.. and you basicalyl get lethality stacked on as a free added bonus.
and in order to COUNTER this "free added bonus" you force anyone who dones't want to get 1 shot at LEAST 1 damage item.
you want to know why people dont bother buying armor vs lethality? BECAUSE ITS NOT WORTH IT!!!
the point of removing damage from out build in order to build armor.. so it DON'T GET 1 SHOT.
if we put the armor in and we STILL get one shot.. then what was the point in building it?.
i have 1900 hp.... i dont CARE if u 1 shot me with 2000 or if if you 1 shot me with 2800 or if you one shout me with 20000000 damage.. its still a one shot. and if builing armor isnt goign to STOP that "one shot".. and i lose offense buy building that armor... why on earth would i build armor?
is 112% gold efficient FROM STATS ALONE
is great except its AP and HP is now too low to be worth it as a final item
take too long to be effective and if i rushed it i would completely miss my biggest powerspike
i already have a gap closer i don't need an item efficiency gated by an effect i don't want
i don't WANT to be in melee range i don't need an item efficiency gated by an effect i don't want
i don't have any form of CC to effectively use the passive with. i don't need an item efficiency gated by an effect i don't want
at level 18 has the lowest base armor at 68 outside of thresh and mini gnar. With