I know some of the bugs were reported in PTS and it just takes time for the devs to get to them but I can also tell that some were not reported by certain players. These players then took advantage of this knowledge and use it against everyone else for a unfair advantage. A few examples of this are mist form, bat swarm, bolt escape which are all game breaking in certain situations(scroll running is one of these). Maybe if we had a new set of testers with a fresh look at the game we could find more of these bugs and balance the exploitable abilities before they hit the live server.