Please implement something to teach players how to play

[SpiralMask]

small teeny tiny nitpick to OP: some classes dont actually get an aoe skill until level ~30 (such as MNK/SAM getting their first at 26, NIN at 30 (on mudra cooldown)/it's first aoe GCD death blossom at 38, SMN at 30 with bane (moderate cooldown)/35 for energy siphon (moderate cooldown)/and 40 for outburst--their first aoe GCD, DRG not getting it's first aoe skill until 40 in doom spike), so pulling the whole dungeon and getting mad for them single-targetting miiiight be on you. won't comment on the rest (such as the 70-80's in your clarification, and on an alt of yours?) tho.