I really hope the departure has happened, guilds absolutely should not be pissing through the lower difficulties day 1 especially while under geared.
Its healthy for the game if they have it where you actually want to gear up with everything you can before you jump into normals and then you actually have to progress through it.
They've made so many good changes to more fundamental things that have gone under the radar during the alpha / beta but this is great so far.
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This is genuinely the difference between say... a US 100+ raider and a front page raider in my experience.
The US 100+ crowd can throughput all day, they have no issues pulling numbers and are often hyper focused on it. When you get higher up its just a given that players can do their rotations, and the big difference is that they can pull those numbers or even be willing to sacrifice those numbers to do mechanics and kill the boss.