(part2) The real problem, which has happened to other jobs in the past and has been creeping up on DRG for a while now is that DRG kit doesn't work with itself anymore. At some points in the job history more than others, DRG had a few moving parts that worked together for something bigger, optimizing those parts was very fun and even when I messed them up, I would have something to watch out for in the next attempt. Lets just look at the different implementations of the job over time and how those bits that worked together used to be:

-In Heavensward, the 4th hit of our combos were implemented, they were also random (which was painful for people with high ping like me), if you hit those you extended your Blood the Dragon timer, and gierskogul was a spender, which shaved 10 seconds of that timer to cast. You would stay on your toes throughout most of the fight for your positionals and try really hard to fit in as many Gierskogul casts as you could, using Blood of the Dragon to reset the gauge and help you with that.

-In Stormblood, eyes were added and in their first implementation you had to gather 3 eyes (from High Jump, same as always) to enter Life of the Dragon, and you could cast Nastrond in it. 5th hit were implemented and RNG was gone from them, which was good. I believe the timer was still there and the 4th and 5th hit increased it and Gierskogul would put you on Life, and Life would make the timer go down iirc. Your goal was to gather eyes and then enter the Life window with 21+ seconds on it to cast 3 nastronds (you could do 4 if you had really good ping iirc). The management there was a lot easier, but in some fights you cared about when your life cycle would begin, so every now and then you would purposefully delay the cycle or even not gather a eye so things would line up better. At some point in Stormblood they changed it to 2 eyes, which made management a lot simpler, but also a lot more comfortable.

- In Shadowbringers nothing changed other than the adition of Stardiver if I remember it right.You still used 2 eyes to build up to your Life window, the timer for Blood still existed and 4th and 5th hits still increased it, gierskogul entered Life and it started ticking down. No problem there other than you might've wanted a couple of extra seconds so you could stardiver.