If lethality was good more champions would use it in the meta but there is like 2 champions in the meta that use it. Just buy fucking armor like 20 armor is enough to negate all the lethality of one item and you buy lethality for the base protections so building armor counters that so just buy fucking armor.
Also Magic pen is just better lethality that is not a opinion that is a fact of that game if you want 18 magic flat pen you just buy a item and that is it but with lethality if you have 18 lethality you have to wait until level 18 like how is lethality better its not it worse in basically every way.
Love that you say all assassins are ad it really shows how much you play this game.