Dualwielding weapons that arent light requires a feat, does it not ? Dualwielding or Dualwielder or something.
Quite the cost, just for having another spell.
Its +2 Spell DC and 2 x arcane battery, in previous DnD editions taking feats that added +1 DC was the best thing to take on casters, this basically does the same thing.
'Just another spell' ... Tell me whats stronger than being able to pump out 4 x level 6 spells in one combat? And with Sorc you can Twin & Quicken them (spend level 1&2 slots on more sorcery points).
With Ethel's hair, you only need 1 +2 ASI to reach 20 casting stat. Normally I would take warcaster, if you use the 23 con amulet you don't need warcaster, so thats what I replaced for dual wield feat. 3rd feat I still take spell sniper for the extra spell crit range and EB.
Given how powerful these staffs are, they are more worth the feat slot to dual wield them than other feats are.