Why does Riot even have a PBE if they don't ever listen to feedback?
They had 2 patches to get the Singed changes right, and then didn't listen to any feedback on the PBE and released all their desired changes as is, only to hotfix nerf him within 2 days.
Everyone on the PBE said that reworked Kindred was completely undertuned and now we've seen Kindred buffed for the last 4 patches straight(including the 7.15 buff).
Zac was the same story as singed and Riot didn't listen to any feedback when they buffed him on the PBE and now he's been nerfed every other week.
These are only a few examples of Riot putting things up for testing and then completely ignoring all related feedback. I've had PBE access during all of these patches and these bad changes didn't just become magically apparent once they hit live.