"I've tried nothing and I'm all out of ideas"
I'm really bothered by how few ADCs build Executioner's Calling against teams with big name healers. I'm even more annoyed when they complain over and over that a champion is busted for healing too much. Why don't people remember that Grievous Wounds exist?!?
/rant
On a more serious note, and I personally consider ADCs to be the most worst offenders in this regard, but why don't people build situationally anymore? Rush boots and surplus movement speed if the enemy team has big slow but dangerous skill shots. Build defensive items if you suck at dodging or they have basically guaranteed ways to hurt you. Consider Statikk Shiv if your team sucks at waveclear. Etc. etc. It's not even like cookie cutter builds are particularly strong right now, it just feels like players are just no longer aware.