There is a difference between doing the fight normally and having enough dps to burn her through phases while killing the plumes, making sure the pillars don't take too much damage, transitioning into phase 3 controlling the clones and doing enough dps to them to kill them before they port and 1 shot everyone without pulling aggro and getting everyone stunned/knockbacked, or moving as a group while killing the plumes in the clock phase while also doing damage to garuda, and than killing her before your dps run out of mp.
And standing at the side of the arena, ignoring the plumes, ignoring the pillars and waiting for a small set of plumes to spawn allowing you the maximum amount of time to kill her before the other 50% of the fight even begins.
Not saying either strategy is hard but i am not sure if you noticed that 1 does completely ignore the entire purpose of the fight and the other doesn't.