A nice QoL change for necro would be making the Major Savagery/Prophecy buff always active, similar to how Grim Focus and Bound Armaments function for Nightblade/Sorc.
That way we start fights with the buff, and consuming a corpse would only trigger the DoT.
This could also apply to the Warden Lotus flower skill, but would benefit Necros more as Wardens can just activate the skill, where as Necros need a corpse to be available.