Flatbows are actually better for pulling than longbows because of their higher arc (slower arrow = more time to retreat), but i'm used to pull with a longbow too and that's not a big deal. But the range is not everything for fighting. I use long ranged bows in high-end areas only actually (FoW, tombs, SF, etc) or when I'm in ranger team with supportive catsers, so the whole team can stay out of range of the opposite spellcasters (in PvE). But still, foes during a fight won't stay at a long bow range for a long time (except, again, when you're in a ranger team fighting foes with ranged attacks), and generally it's a matter of seconds after the beginning of a fight before several of them come at a shortbow range.
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