I have played Nexon games for 9 years straight and here is what I can tell you.-------------------------------------------
People have been complaining for years and some things gets fixed while others don't.
So if you are expecting all of the issues you listed to be fixed by Nexon then you aren't in reality currently.
Mabinogi/Maplestory/DFO/Vindictus/DN
All great Nexon games however I seen issues related to all of those games that never were fixed.