Yes it is. A lot of things are related to another. You touch one, another breaks. Even the korean devs couldn't fix most of the problems and they got carried over to the current version.
It is no surprise trying to build stuff on a bugy code will make it even more buggy.
Ok so you are completely fine with the games current situation ? And do you really think aeria is seriously trying to fix the game or do they just keep it running so it is barely playable ? Do you really think that it's not possible in almost over 2 1/2 years to achieve improvements ? I think it should be possible to at least achieve something during that time. I am not expecting a fully fixed flawless game. But when you crashing after every 3. leave/join/loading etc. that is a major sign that there has to be something done and nothing is being done to seriously improve the situation.