Let`s talk about adaptive helmet
Lets be honest adaptive helmet has a problem with what things it can reduce.  dmg being toned down cause you counterbuild is fine, but s or s entire dmg being reduced by 15% just cause their autos are magic dmg is bonkers. Its like Riot tried to apologise for Tabis by just making everyone with magic dmg auto attacks be screwed. Corki has it even worse then Kogmaw since now
and
reduce your dmg by 15%. Both these champions arent even in a good spot right now except for maybe  since he isnt Sivir tier trash. Think about it
is a better choice for a adc then these 2 since atleast there is no way of counterbuilding against her after her getting 200 cs despite being 0/24.