When I first started playing Warhammer, I didn't pay much attention to Chaos Marines fluff, but common knowledge had it that the Night Lords were lightning-fast-hard-hitting-terrifying foes in battle. Their special unit was the Raptors back in the day, I always pictured a Night Lords army all in Jump Packs. So I always had it that they were kinda like a Chaos version of the Raven Guard, except more brutal and less "ninja".
I have been reading more recent stuff and it seems they shifted to a more Raven Guardish ninja style, favouring cover-ops and with an emphasis on elite warriors (few in numbers) and terror tactics with no focus on jump packs whatsoever.
Was my idea wrong back in 3rd or 4th edition 40k or have they truly shifted the Night Lords modus operandi?