So this expansion introduced some new tech that allows skill buttons to automatically change based on certain conditions, and you see this primarily in PVP. Key examples include combos, like the BRD shots/bites, but also skills that respond to buffs on the player, such as Flare/Freeze/Foul for BLM. If this was a change that went through sometime late in the last expansion, forgive me, I haven't played in a while.

Now this is really exciting, especially if it gets expanded into PVE settings. Some great applications of this would be for WAR skills. Under Defiance, you have Inner Beast, Steel Cyclone and Unchained. Using the new tech, these skills would simply switch to their Deliverance versions: Inner Beast becomes Fell Cleave, Steel Cyclone becomes Decimate and Unchained becomes Inner Beast. This is both a great quality of life change and a more elegant solution than using macros.

Oh, and apparently there's a limit on how long posts can be, so this is part one of two.