Yeah, parses are a kind of ladder and right now if you go in raids without WB you score really bad. Many guilds/players feel pressured into getting WB to get a better score.
The idea behind this change is probably that we’ll now have a separate ranking with/without WB. That way you can play without WB and get good parses in that “category”.
Imo it is a smart change. Removing WB altogether would have caused an outcry.