Built-in Parsers

[SDaemon]

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Depends. Is that 20% lower still within the required DPS to clear? If so then the issue clearly isn't with the party's DPS and they are failing mechanics. However, a group will likely just kick that 20% less DPS in favor of trying to push out more DPS in hopes of winning. As players are able to push out greater numbers they will gradually expect the overall community to do the same regardless whether or not the content requires it.

If that 20% less DPS puts them below the threshold of what each DPS needs to do in order to clear the encounter then yes, that person should be replaced or guided in a way to help them improve.

If in a group someone is doing amazing DPS and they are below then it again depends. Are they doing well? Are their numbers enough that in the scope of the fight they are doing their fair share or more? Just because someone is doing 5k+ DPS and they are only doing 3k+ DPS doesn't mean they should be shamed or made felt like they are being carried, not if the fight only requires a personal DPS of ~2k. (The numbers are figurative, the situation is my driving point.)