not problems like “Why doesnt succubus give succ?” Because that would fall within the purview of your conundrums of philosophy of “Breaking user conducts of owning a succubus”
"TO THE POINT"
I play hearthstone and hearthstone has warlock and kinda plays around same rules as wow. So it hit me, taking ideas from a card game “its bad idea” but idea nonless.
One that came to my mind immediately was BIG IMP, basically you need to sacrife or kill your demons to summon BIG IMP, almost like tyrant sucks your imps to become stronger, but if your say… wrathguard or blueberry died mid fight, you could summon BIG IMP.
Other is demonheart, you could do damage with it or empower your demon for small amount of time.
OR
Ectomancy, double your current imps while ectomancy has long CD
OR what about a new imp?
Flame imp that deals damage to you but deals even more damage to the enemy.
Affliction could get poweroverwhelming where they could buff themselfs allot but than take allot of damage theirselfs or do the opposite, buff the enemy but than they take allot of damage.
also Corrupted mist, where you corrupt a area and enemies take corruption damage (havent played affliction so no idea how powerful it is)
Lets throw few more ideas.
Blood imps, you replace your regular hand of guldan imps with imps that heal you and have stealth OR
Imp gang boss that is one bigger imp that summon imps for a small time, one by one and deals little bit more damage than regular imp.
Lastly, Howlfiend that would replace your stalker, basically it does special attacks that needs soul shards from you.
oh yeah i forgot destructionlock…
well they are pretty good with chaos bolts…soo… they are fine.
Anyways, there are just ideas because i feel like, demologylock could be better for all of us, and affliction.