The first video lost me when they stated that every job should get their first AoE at level 15. Let's develop bad habits as melee DPS (the ones who absolutely don't get an AoE at level 15). Players who get AoE at 15 tend to use it forever after, much like Ice Mages who realize they don't lose MP when they throw Blizzard.

No learning combos, no thinking about when AoE is appropriate and when is it not, during leveling. Just AoE everything, it works fine, right?!

Sure, there's information about non-AoE in the video, but the basic gist of the first video, repeated a number of times, is "AoE at 15".