-His Pose of Duel ability doesnt do anything at all
Did you even try it out? I have been an earth main since I started playing the game and it worked really well for me.
-The Earth Stone Fist Justu always targets characters who isnt doing ninjustu so its interuption debuff is useless
Are you using auto? if yes, then don't complain.
-The Unyielding ability only activates once per battle but it clearly says once per round
Translation bug, saw it a couple times in the game, not only for the earth character.
-Only one Chase skill is actually worth using ((Front Lotus for Ignite Debuff)) making it necessary for him to combo off high float
Different setup requires different chases, so I don't even see how you can complain about that. They all have different attributes to them e.g. Taijutsu, Ninjutsu, Earthdmg etc. It is not only about what kind of status they afflict.
Iam having a really hard time reading what you wrote and honestly think you didn't think it through at all and that's why you're having a hard time.
Iam on Server 35 Hebihime and I beat most of the stronger ones I encounter as Earth Main and I never used a healer.
Where I can agree is that Earth Main Character has a falloff compared to the other Main characters and that is in the mid game area, where most of the servers are now, so maybe that's why you feel like that.
But I can assure you as soon as the update comes with the new skills for each main character, you will love using earth as he is probably the strongest one to use then.