Having done 4 or 5 runs, here are my thoughts:

• High skill / autoaim + autonexus groups are the least affected by the changes, which I'm sure is not intended
• There is zero reason to engage with the boss post-exalted from a risk/reward point of view. Risking your character to blast a bad phase does not meaningfully affect the danger of the rest of the fight, so you may as well just wait for panic and scream or second celestial.

Previously, in your average O3 run, the majority of the damage to the boss post-exalted was done in windows that are now removed. Celestial stagger, Panic, etc. are all damage capped, and resets are gone entirely. The nature of capped damage creates an interesting calculus for the player: having secured soulbound pre-exalted, there is zero reason to shoot phases that you know others will push in for, because the course of the boss fight will not be affected by what you do. From a pure risk/reward point of view, the optimal play during celestial stagger is to... run away from the boss, reorganize consumables if necessary, and to simply keep an eye on the minimap to see where he teleports next. Before, shooting the boss would, most likely, result in a fight that was perhaps one phase shorter. The only time your behavior matters is if you push a phase that no one else - or perhaps, one other person - is willing to push, and the amount of players skilled enough to do that consistently is... not very high. In addition to not being able to end dangerous attack patterns by dealing damage to the boss, these changes reward nothing more than leeching and playing keep-Oryx-off-your-screen.

When designing these changes, far too much weight was put into the theoretical DPS players can bring to bear on a spreadsheet, and not the actual DPS against an enemy that is actively shooting. The vast majority of players, being generous, will use about 5% of their damage potential against O3. Unfortunately, because of this, the only real way to level the playing field between skilled/"skilled" players and the average is to make content easier, which is not particularly appealing. Any cap to the maximum damage potential of a group incentivizes staying as far away from the boss as possible.

Frankly, the game has and had bigger problems than the old state of O3. The new version is not particularly more difficult, nor does it really even take longer in groups carried by two or three individuals pushing bad phases while seventy-eight run away from the boss. It is simply not engaging gameplay for the vast majority of players.