Why are people assuming that a Corsair's Haste roll would fall under the magical category?
Last I checked Phantom Roll was a Job Ability and there's really only 2 sources that give that (which you can full time)
10% with Hasso
5%-10% with Haste Samba (better be 10%)
If Cor does get a haste roll and it is at least 10% (on average) then you can feasibly use a DNC [OR] a COR to get 80% haste instead of now where you can really only hit that if you have a DNC in the party or you are a DRK for 30 secs.
If you have a COR [AND] a DNC I'd imagine you could even drop Hasso for Berserk. I mean you would have 80% haste without Hasso so at that point you are essentially trading 5-10 Str 10 Acc for +25% attack (and the loss of third eye/seigan/store TP)....err scratch that, not sure +25% attack is worth the loss of store TP.
Heck, at that point Haste + Marchx2 + Samba + Roll + 25% Gear haste actually might give 1h weapons a greater edge then 2h weapons due to the fact that now both jobs have 80% haste while the 1h jobs still have dual wield.
80% haste = 5x faster
80% haste + 20% Dual Wield = 6.25x faster
80% haste + 40% Dual Wield = 8.33x faster
That makes Ninjas with Suppa and Chainmail attack 66% faster then the 2h weapons (if their delay were equal)
This is of course assuming that the 80% haste cap is just haste and not just delay. Not sure if you could push your delay lower with Dual Wield