Honestly, I originally had a much longer, more detailed "hot take" drafted out at first, but my app crashed and it didn't save... 😦
But the TL;DR is that a recent update to Archangel's Staff and Seraph's Embrace in the PBE for Preseason basically turns many of the Champs that usually build it into high-damage off-tanks.
So yeah, imagine trying to 1v1 Syndra as Zed, only to get stunned then see most of your damage theoretically get soaked up by her mana, only for a good part of it to get restored from her beating your ass to a pulp.
Correct me if I'm wrong, of course, but personally I'm looking forward to this change! I really don't like the current AS and SE, tbh. They don't feel like "AP-scaling" Tear items, imo - more like "CDR Tear items" at the moment. Hopefully, this changes that in a very fun way!