1. I don't think the 3 subroles of dps have much identity after shadowbringers. They all exist purely to deal damage and mechanics meant for specific roles to handle can usually be handled be other roles. Look at the extra viper used for m6s gimmie cat instead of phys range.

2. Jobs within the same subrole have their personal damage output balanced around if they have team wide damage buffs or other utilities like reapers regen. This makes jobs like samurai and viper have high personal damage and jobs like ninja and dragoon be a bit lower but the dps they contribute to other's personal damage is supposed to (but not always) make up for it.
3. Melee has been overly catered to over 3 expansions. They have the most jobs and consistently have higher damage while bringing just as much utility as the other jobs in other dps subroles. Is there any reason for black mage, pictomancer or machinist to not be more inline with Melee with the current encounter design? The 4th dps slot should be a flex spot for any role not just melees 99% of the time. We had picto being a viable choice until people cried for nerfs because it dared overshadow their precious Melee mc complex. Shadowbringers removed resistance down from jobs with the purpose of less restrictions for team building but ironically that made every comp 1 phys range 1 caster 2 Melee. In stormblood you could see stuff ranging from dragoon, bard, machinist and summoner to double caster with summoner and black mage.

This may not sound like a big deal but it exasperated certain jobs getting locked out of their role slot. When machinist is strong nobody brings bard/dancer and machinist personal damage is t high enough to bring it to the flex slot anymore. Machinist is selfish and would love to use the buffs the other phys ranged brings but it literally can't. The casters had 1 window where red mage picto was strong but now that's gone and we're back to melee walker. The current role restrictions on party comps is going to make certain jobs always feel problematic.

My proposal would be to normalize the rdps of ALL the dps or throw out the current role restrictions. Double ranged shouldn't suck for no reason.