They really screwed up the sheen item set.
Lich bane being a bit awkward on certain champions.
Iceborn gauntlet out performing frozen heart on stats and passive.
Trinity Force getting changed to be "suited for adcs" while it was almost always built on bruisers, while sometimes Ezreal and Corki.
Sheen items were in a solid spot in season 5, they provided what both wanted and needed, they were not built outside of the group it was aiming for, and did not over perform or outperform other options, which meant they were situational and have you chose on how to approach those situations.
That's how items should be. You decide what would be better for one match, but still have the other options in case you change your mind. The other items still had benefits if chosen over the others, they didnt just simply over shadow ever other options just because.
Now that I think about, they are making the same approach with items like they did with game modes. They are removing option and making the game less about decisions and more about "we counter/out perform you". This can be applied with items (ibg vs fh), dynamic que (solo player vs premades), and champions (tons of examples).