I will never for the life of me understand the weird infatuation with Greased Lightning. It was an unfun, clunky mechanic that forced a build up to a degree no other job had to deal with and then a maintain that was tedious at the best of times and impossible at the worst. It was never monks 'identity', it was a blockade to monks identity, which is a flurry of weaker attacks as opposed to Dragoons slower, heavier hitting ones. Both Dragoon and Samurai's buildups are for fairly low additions to DPS and or speed while also being an important part of their rotations, while monks encompassed a far larger portion of their damage and speed increase while either requiring special means or simply more time to reach max stacks an in exchange they did similar DPS for unarguable more buildup and maintain. Having Twin Snakes be the only personal maintain puts them far more in line with other DPS classes while not sacrificing their actual identity, speed.

With Greased Lightning as a mechanic gone this allows them to focus more on the core of the job and move away from having to go to such great lengths to maintain a single buff. That being said, the jury is out on whether or not they'll be able to capitalize on this or not. This is the team that went into Shadowbringers with Summoners in the shape they were in. But flipside, its also the team that managed to fix summoners in a fairly satisfying fashion before all was said and done so...we'll see. I'm expecting fairly large changes for both jobs in the next expansion either way.