Everyone is free to utilize the Class System to play solo or in small groups however they see fit.

Everyone will be expected to fulfill a Role (Job) in a Large Party, whether it be a grind party or esp. a Boss Fight.

Some PT's might be more lenient on Class Abilities/Jobs but the bottom line is that this IS an MMO not a Single-player RPG, therefore we all eventually have to conform to whatever standards are deemed optimal for Party-based-play.

Do whatever you want to do by yourself. No one is stopping you.