I honestly can not make heads or taild of this speculation posted on Wowhead. Someone please explain what the heck it is telling us? Wish blizz will chime in and clear this up, whatever it is.
Sure hope it isnt broken. I do not want to grind the XP until it is fixed, why grind it if its going to reward more, or it SHOULD reward more, either now, or in the future. Only Blizz can answer this as it seems only speculation atm.
So if a quest gives 500 AP now it gives 500 AP now.
Since the second week of 8.0 the maximum level has dropped for each level of neck (so less AP is required per level), its a catch up mechanic for alts/ new players.
Its just that this week due ot the patch did not get the level reduction it should have, it will reduce next week as always (or should).
If you are holding off then you need to hold off forever as AP is always worth more week to week and always has been since week 2 of BfA.
Going back to the 500 AP.
If the level you are at this week needs 1000 this week, it will require 30% less next week. The 500 AP is still 500AP its just it means more the lower the max required, but you willl hold off forever using your idea.