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YES you still need a boom vang. The kicker supports the boom, the vang limits boom lift and helps provide leech tension when the sheet is eased.
The kicker is a good thing too, as it supports the dead weight of the boom in light air, but it in no way replaces the vang function although many rigid vangs also provide the support the kicker does.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)