Yeah - iirc I showed how grouping works in the first few videos, and also did in the last video. I did do the Tempest Spine episode duo-boxed because of the INT rune. Though the goal was solo only, so I didn't want to group generally.
Different to mention, different to at least join a group and play a few dungeons with others. To illustrate the actual mechanics and community behaviour.
Sometimes, the behaviour is great (grouping with No man is left behind mentality) other times it is OMG (grouping with the zergers of hell).
And I do believe there is value for the new players to have exposure to both behaviours.
ps: For no toon is left behind, I will be happy to join and help you on the video. I do happen to have my main at level 21 right now. For finding a zerger, I'm pretty sure you can get an r1/daily LFM for a quest :-D I remember sometimes that the time it took me to start they almost finished the quest... and I was like ok turn back exit the door leave the group and hope for a better group next time

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Cheers