The problem of melee similarity of gameplay

[Shurrikhan]

I see absolutely no reason to replace perceived inter-role homogeneity with intentional intra-role homogeneity.

If melee are overly similar, that's a reason to address job design and build upon their unique aspects (e.g., the twin blades vs. double-blade of Viper, the inner energy of Monk, the jumps/dives of Dragoon, etc.) to make their shared portions a smaller part of the noticeable whole by expanding the gameplay of each, not a reason to make each job more similar to its opposite in its gear type (NIN to VPR, DRG to RPR, MNK to SAM).