Okay so basically rather than buffs/a DOT you now have buffing GCDs and spending GCDS.

Dragon Kick gives you one "pip" of buffed nu-bootshine. Twin Snakes gives you two pips of buffed nu-true strike. Demolish gives you three pips of buffed nu-snap punch.

So the rotation outside of burst window is essentially the same, but now people don't have to watch buff timers and can look at the shiny Job Guage™.

With this in mind one guaranteed change is that we no longer need to refresh twin snakes buff before PB. Maybe a bit of complexity lost but not a big deal imo. As for how the 2 min burst window plays out I think that needs some more in-deptth theorycrafting. So we probably won't have the exact optimal drift as before but maybe in exchange you may need to think about having enough "pips" so that your Rising Phoenix PB sequence doesn't use unbuffed GCDs during party buffs. Maybe someone smarter than me can visualize this better or we can wait until media tour