Having higher level gear shouldn't BREAK coil runs!!!

[saeedaisspecial]

Like i said before , there is NO fight (except ifrit ex if you totally overgear him but you can just watch out for the time you reach the execute phase :P) that forces you to stop or lower your dps because of phase shifting. There is always another workaround.
If you can't find that workaround or if you don't have the necessary skill to execute this (not that those workarounds are hard but who knows) don't blame the game for it.

While true, there can often be times that the phase changes can completely ruin a fights flow. Take Turn 7 for example, depending on when you phase change you can end up in a situation where a Shriek occurs while no Renaud is up.
It is ridiculous that these situations can occur, especially when evidenced by Turn 7 Savage, the devs intended for you to kill Renauds after once application of voice.
Assuming you're doing the "correct" strategy, being the one the devs clearly intended. These situations should never occur, but they do. This results in the only way of properly managing these changes would be to either perform a strategy that is not what the devs intended, or (until 2.3) to utilise third party tools.
Neither of them are acceptable, content shouldn't be designed so that the devs intended method of defeating the encounter is invalidated because of the parties DPS.

Players should not have to modify fights every few weeks because their item level has increased. After our first T7 kill the following week we had to spend time relearning the fight to account for increased DPS from new gear. That is really stupid.

To go even further, look at Leviathan, while no instant-wipes occur, having DPS too high completely breaks the fight and causes mechanics to completely be skipped/spawn early. This is another example of fights breaking/the flow of fights being ruined because the devs do not have the foresight to plan for players DPS increasing.