So what's the point of the PBE if feedback is ignored?

So the 5.2 patch notes are up, and despite the response to the tier 2 jungle item cost increase being negative almost everywhere I looked (these forums, the reddit, surrender@20) there is it in the patch notes.

Everywhere called it out as an unnecessary nerf to the already weak early jungling over a problem with the first blood mechanic, that would have a significant effect on a substantial portion of jungle champs despite Riots claim that the change would only effect "a very specific situation".

I get that sometimes big changes have to be pushed through despite pushback, like the overhaul of masteries or the new jungle, but when a small change has a much larger negative change than it seems like was intended, that seems like exactly what the PBE is for, to find those unexpected consequences and let you rethink or rebalance things, but it seems MORE like you use it as a pre-view system than a beta for testing out experimental changes.