Take a look at the bigger picture with the image.

They are an 8 player balanced party fighting Leviathan.

Based on established FFXIV balance logic and evident gear, we have:

2 tanks: 1 war, 1 pld
a mnk and a drg
likely 2 healers, at least 1 sch
2 others in cloth. 1 definitely a caster, the other equipped with what could easily be a cudgel.

You are perhaps looking too deeply into this, OP.