This game and its players are so obsessed with gladiators that I genuinely believe it is unhealthy for the game in the long run. Let me explain.
First off, why do you even play a game? For the enjoyment. For that recognition. You want to help out your friends or other people in Isya, you want yourself to be valued by the community, you want to be wanted. Well, the game has spoken, they literally just want Gladiators. Have you ever seen those roars that go "(Insert guild here) recruiting capped glads only". As someone who doesn't play a glad or have one, that's downright discouraging.
Also, at world bosses such as SK, there will be one expedition group filled with gladiators and literally any other class is considered second rate. Doesn't sound fun to be second rate to me. You're not a gladiator? Well, sucks to be you, you can't join the party.
Even when you do bring something to the party, you're just there to support these gladiators. For example, I've heard people want crusaders, not because they bring something to the table, but because they have this buff to boost a glad's damage. Or, having a Spectre in the party wearing DDF, just to boost a glad's damage. It makes other classes feel like a joke to be honest.
Really, what is the point of playing other melee classes if you're just gonna get thrown under the bus. People who don't play glads are just gonna be like "Well, I don't play glads, parties don't want me, I'll just quit then"