Why am I so attracted by brawlers?!

That's low dex. Doesn't matter how low it is. If you use dex from equips to wear your knuckle, you're low dex.

Here's how I see it.

Sin with 25dex using all luk gear+skanda=dexless
Sin with 25dex using dex gear for dex req claw=pure luk
Sin with 25+dex using dex gear for dex req claw=low-dex
(depending on which claw equipped this can go up to regular-high dex)

So for pirates

Buc with 20dex using all str gear+maple knuckle=dexless
Buc with 20dex using dex gear+Dex req knuckle=pure str
Buc with 20+dex using dex gear+dex req knuckle=low-dex
(depending on which knuckle equipped this can go up to regular-high dex)

Just realised that makes myself pure str instead of dexless, thanks.