To me it’s pretty simple:
1)All DPS are evaluated against all other DPS. You could have cleared with four Summoners if you wanted to. We have the numbers to support that.
1) Selfish DPS should be worth more than Raid DPS due to multiplicative stacking generally inflating the latter.
2) Jobs with higher execution barriers (Hardcasts/Channels, Melee range, Positionals, higher APM, Gauge/Cooldown Bloat) should be worth more than jobs with less to worry about.
3) Conversely, jobs with affordances that make it easier to be consistent (Dashes, Range, instant casts, less buttons, buttons light up that are always the right choice) get taxed for those extra affordances. Either
4) Powerful and unique non-DPS Utility that makes you better at fixing other people’s mistakes or preventing a wipe (Raises, Healing throughput, mitigation) or has the potential to invalidate or otherwise replace other roles (AoE healing in particular) needs to be taxed accordingly.
5) If any factor in the above is role based you don’t compare it within that role unless it isn’t applied equally (Raises, Combos, Positionals, Defensives), but you do when comparing between them (Addle > Tactician > Feint. Bloodbath and Second Wind).

Generally speaking, if I were to select one DPS from each role to be the closest to one another, it would be Red Mage, Machinist, and Ninja, smack dab in the middle. If I were to nominate a role that should be the most spread out in contribution, it would be caster DPS (BLM > RDM > SMN). And I do not think that is controversial. I’ve raided in two expansions with Triple Caster (BLMx2/SMN/BRD Gordias, BLM/SMN/RDM/SAM Omega) where it was considered to be objectively harder if you didn’t follow the meta. This game doesn’t ask anything of you beyond being willing to try. Every class and party combo CAN clear (I had WHM/AST for both of those groups). The devs have always allowed for it.

What’s not okay is everyone expecting to be balanced perfectly by some subset of DPS. All of those above factors (and some I don’t agree with, like popularity) are something you’d expect to be included in SE’s own metrics (Literally the only thing that explains Monk). We have an explicit flex slot and extra stats/LB generation to encourage spreading out roles. They assume the worst of us WILL be progging the whole tier. All we’re whining about is stuff that will only half matter for 6.2 World First and only Machinist (and Monk) are specifically out of line in that regard. Compared to how it looked pre-6.08 I’ll take it till they overbuff Summoner again.