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Which lends towards having a faster weapon speed if I am not mistaken.
Which got me thinking whether this (the set-bonus) could be an attempt to improve the value of haste. Not using the actual spreadsheet, tbh (religious OpenOffice user), so pulled Ensidia's Hunax into the online approximator, changed all Arpen to JC haste gems and assumed ((20 * autoshotspeed - 10) * 1 + 10 * 1.15)/(20 * ass) as multiplier. With full buffs/debuffs enabled, this leads to
10239.92 for Arpen
10225.29 for Haste
My math might be funny and ofc this doesn't include future stats but I don't see that haste becomes more than competitive.