As main Warlock, I really like the Dark Apotheosis (https://wowpedia.fandom.com/wiki/Dark_Apotheosis) but that’s a complicated off tank ability which was really interesting change of gameplay.
But regarding something that I’d love to have back is the destruction Dimensional Rift from our Legion Artifact weapon.
Also, you mentioned a lot of abilities around “Threat”, Warlock had an ability to reduce it via shattering a crystal, I think Blizzard remove the gameplay around Threat between tank and dps/healer classes because didn’t have appeal for some players, i liked it.
