That’s not how the original raid worked. The Destiny 2 version is a variation on a raid challenge.

in atheon encounter, 3 people randomly teleported. reworked oracles makes the encounter harder.

But were free to shoot the oracles in whatever order in the base raid. The challenge was the combat, and keeping people cleansed somthey could see to shoot. Sequence didn’t become an issue until the Atheon Challenge during Age of Triumph. The challenge of being able to only shoot one Oracle forced you to have to get your entire team in and out of the portal, keep track of who is shooting which Oracle, and do it fast enough so that the Oracles don’t wipe you. The D2 Atheon fight is a simplified version of the raid challenge. Which, as I keep saying, doesn’t make it appreciably harder for veteran VoG raiders. But it is a nasty stiff arm to new players wanting to get in and learn the raid. Put a first time player in that role? Your raid will fall apart.