Knowing how this seems to happen often with Blizz

Knowing how this seems to happen often with Blizz, I bet this was intended unintentional "error". Instead of dealing with the complaints in a PTR patch note for weeks, just do it at patch day so even if people complain, nothing can be done about it. Blizz has been doing this http://www.euwowgold.fr/ for years, why change now?