You clearly are delusional first of all where are your sources about the nickname because you have yet to provide any also you do relise Koreans characters are way different from those that are English…
Underpowered half of the classes? okey agien where are your sources to justify the power you need to describe the scenario… because depending on what you say ill give two exsamples.
Bad exsample
OMG warriors are so underpowered I could not solo 3 wizards this sucks.
Good example
Damn this single target healing ability does not seem to serve much over my aoe heal might as well just use the aoe heal and forget the single target heal.
Now your point about the wizard / cleric tree okay lets give a simple response to this wizards have a charge up time that can be interrupted and there dps is lowered by this because DPS is to do with the amount of key strokes you can do within a time frame and as for clerics they relies on buffs for there output.
Tanking and healing are roles lets put it this way to beat a boss that deals a high amount of damage is the soul reason you need a tank they are designed mechanically to absorb damage it is there role and to keep said tank alive you need someone who can support them via means of mitigation or healing.
A class is only obsolete if its not needed so this could apply to every class in the game for instance a group needs a healer looks like who ever is a tank/dps class is obsolete and vice verses for other classis depending on the need of the battle.
They said clearly don’t you read that at the moment till the 29th until they get more data that means they need more evidence to validate the making of more servers because as we all know servers are not free to run.
So please stop spreading false information without any evidence/sources.