High Impact Sniper are still invaluable in PvE for their staggering capabilities. That's why in raids high impact is still necessary, as you must stager Oryx or risk a wipe. As far as 1000yd stare goes, it grants an extra shot for free and for PvE strikes the percentage in damage done just from having one extra bullet is impressive. Outside of this however you have a very good point!
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Yea the 1000-Yard Stare with triple tap does very well on bosses for me. But when I thought about it more, the faster firing snipers normally have a larger magazine size, and can also get triple tap. That does not account for the staggering side of things though.