i'm not 100% sure, but i would imagine that for bst/smn/pup (the 3 main ones that get it {i know dnc gets one lvl of it, too}) having all your pet timers as well as your own timers gimped by slow would just be crippling more so than for other jobs.
take bst and war for example:
a war with slow still deliveres a lot of dps, they are less dependant on timers outside of berserk/warcry for WSs
a bst with slow cant use sick as often as it needs to be, or any spells/abiilities based on their /sub, or mitigate dmg through snarl as much
it just seems that the pet jobs are much more dependant on a larger number of timers than other jobs.
drg would be exempt from this, as the wyvern behaves based on actions the drg takes. I.E.: drg casts a spell and the wyvern uses the ability at the same time, no having to hit a macro JUST to cause the wyvern to act.
the bst and war issue goes the same with pup and smn. a pup wont be able to put up as many maneuvers, limiting what his puppet does more so than just if the puppet were swinging its weapon slower.
with smn, fewer bloodpacts and longer casting times for summons can pretty much take us out of the fight as they can take a while to go off as is.
anyway, thats my 0.02
i'm glad we have resist slow, myself
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Baijin
Server: Fenrir
MANthra BRD75, BST77
almost all other jobs at 40 or better