With the latest update to BLU all stances now have an effect on some spells but the description for aetherial mimicry: dps does not reflect this as it’s the only one that doesn’t say “augmenting certain blue magic spells” even though it now augments Matra magic.

I’d suggest changing the description to something along the lines of:

“Mirror the aetherial properties of your target, granting yourself a beneficial effect corresponding with the target’s role.
If target is a tank, grants Aetherial Mimicry: Tank, increasing your defense.
If target is a DPS, grants Aetherial Mimicry: DPS, increasing critical hit rate and direct hit rate by 20%.
If target is a healer, grants Aetherial Mimicry: Healer, increasing healing magic potency by 20%.
Augments certain blue magic spells based on the role that is copied.
Cannot be cast on self.”