Dex boosts your Defensive Ability so yes you still need it.  And for Stonebinder's the Dex requirement is way higher than it used to be.

Ah that's annoying! I just checked and with a consistent 2:1 distribution and maxing out the Masteries it still gives enough Dex to wear them, so I think I'll stick with that distribution for now (unless I find I need to more energy or health I guess, though I seem to be doing ok without).

Do we know if Atlantis grants any bonus attributes or skill points?