The funny thing is, the 200 dps gap is specifically referring to the highest percentiles. The gap generally becomes wider as you look at lower percentiles. In fights like Neo Exdeath and Shinryu, when you look down at the 50th-75th percentiles, it's more on the order of 300-400 dps. The problem with presenting the percentile data to people is that they deliberately ignore the massive gap between WAR and DRK at the percentiles where they actually play at and quote the max value. When you look at lower percentiles, you start to see non-zero tank stance uptime, groups without NIN, and you start to see the effects of the Grit double tax.
Tanks are probably the only players in the game who pretend that having nearly the entirety of your dps condensed into pressing Damage Up! + Big Damage spam is like climbing Mount Ordeals rather than an optimisation advantage. It's like those folks in HW claiming that FoF usage was the height of technical skill. It's just self-aggrandisement. The average DRG gets over this sort of thinking by level 30.
If you're playing more casually or are jumping into trap groups, you'll see a much wider variation in your teammates' skill. You're dependent on clutch performances from a few teammates to make dps checks. It's actually that much more important to get every bit of dps that you can out of your rotation.
As a side note, with regards to Reprisal: I find it interesting that the devs showcased it in the middle of the
Stormblood job action reveal for DRK, when it was actually just in the process of being given away. Giving Reprisal back to as a DRK exclusive wouldn't shift players back onto the job on its own without some dps parity, and there will always be times where DV and SiO will be stronger (since they don't require a target), but it would help.