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Ultimately you need a core 25, essentially: the assurance that 25 people that know what they are doing will log in for any given night. As an example, I was the only enh shaman for a guild and my att was about 66-75%; this didn't work well, as there was no other enh shaman, and so the raid makeup would have to alter based on my attendance. This is where things go awry. If you have 4 paladins with 75% attendance, and roll the dice badly and only 1 paladin shows up, that can ruin your entire night.
You can definitely have 20 people with 98% attendance and then 20 people with 25% attendance. It's not a big deal, encounters aren't tuned so tightly that a few undergeared players will break you these days. But those "casuals" have to be special people; the kind that know exactly what to do, the kind that watch videos and memorize strats. "Casuals" in a hardcore guild should know that they are expected to work outside of their logged-in time, to keep up with the rest of the team.
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