Yes a PTR is needed. There are so many things they have released which makes me wonder "why did you do that?" After seeing WHM I believe it is really needed badly. Just lock out story quests and make a test dungeon with level 70 mobs and allow people to pick the job they want to test. This way you can actually get player feedback instead of this internal testing which personally from what I have seen is not the best.

So many small simple issues could have been avoided if there was a PTR server.