Tbh I have some gripes about series that are like "this class is shit so no one plays it." Like... every time it's in a very active live service MMO too. It's not like they release a class and are done with it, there's buffs and nerfs and reworks all the time. Not a problem exclusive to this webtoon, it's definitely a bigger issue in manga where playing a shit class in an MMO is the entire premise, but like this is a completely normal MMO so it stands out more as a totally fixable issue
That, and even if it's a shit class, there are always going to be people who want to take on that challenge. They shouldn't be so surprised