I looked into grimtools and found no ADCtH for Blackwater Cocktail. Did I overlook something? Spam version for sure needs it… It would be ideal on gloves, so that it does not block anything useful or does not break any sets.
These gloves could have it.
what happened to not fixing every healing issue with slapping adcth on everything 
We have two sets for Defiler. One for cold BC and one for fire BC. How do you propose to sustain it?
I just went for Drain Essence instead and use BC on cooldown. To hell with BC if it does not have ADCtH!
Having a spam skill with no ADCtH is just not gonna work in most cases good enough. If the masteries have two health regen skills you might work it out. But Defiler for example is not the case. And it is quite standard these days to have ADCtH. And regen has its own problems…
Defiler part of Dreamwalker doesn’t scream spam BWC to me. You have a lot of passive leech sustain vs groups (Omen + set proc) and you can DoT & kite versus bosses.
If you want to actually leech off BWC you can play around the new MI spear that adds weapon damage to BWC ticks.
Just randomly adding leech to BWC seems a bit off. The skill was that way for as long as the game exists.
You can play both but that is not the main point. The main point is that spam skills require ADCtH to be good enough in endgame.
ADCtH heals instantly. Health regen takes one second even if it is high. A lot can happen during one second. Even 5k regen takes like 4 s to heal you for a typical 20 k life build. In 4 s you can be dead many times over. ADCtH is instant. GD has become a fast paced game with a lot of damage going both ways and for spam skills going regen means it will be a meme. Regen is for kiters who do not have to stand in front of enemies or for melee as addition to ADCtH.
Yes. A meme item. 16 % WD is not enough for leech and it blocks important items.
This should not even be debatable that potential spam skills require ADCtH… Even Stun Jacks have it 
Do we really need every build archetype to play & sustain the same?
There are other options available.
Regen.
Dryad.
Not everything needs ADctH.
Yes. A spam skill does indeed need ADCtH.
When I think about it. This might be the last one without it…
Not every skill needs adcth. Demo is one of the best regen classes. Just play regen and don’t face tank everything.
Spam skills require that. Cooldown skills don´t. If you play grenado or canister then regen is good enough. Spam skills cannot kite like cooldown skills. You will lose your damage output.
Even Stun Jacks have it…
Dream walker set is a DoT set. Cool down BWC is best for DoT bc the TDM affects the DoT.
The set is irrelevant to the argument. The point is having a potential spam skill and no ADCtH. Whatever the damage type… The current mechanics of GD will make such a skill not good enough for endgame.
I am sure the same arguments were there for Stun Jacks and they got ADCtH. Why? Because it is the sensible thing to do…
By contrast, Stun Jacks do not also provide Damage Reduction and/or Resist Reduction.
One could make a case that, if anything, BWC should actually be nerfed rather than buffed.
That does not matter. DR is available by many choices. Some skills just have it directly. And the value of ADCtH can always be tweaked to not be OP.
Arcanist has Maiven. Every Arcanist takes it. Can you even imagine AAR with no ADCtH? It would suck…
And BC also requires far more points than Stun Jacks.
You chose to compare Stun Jacks and BWC. You do then not get to play the “it doesn’t actually matter”-card and make yet another strawman comparison. That is not how discussions work.
The short and simple answer is: there are alternative ways to sustain. Use them.
All spams skills have it for a reason. They got it for a reason. We have already laid out the arguments. So let´s not continue further.
Let BWC be BWC, it’s unique enough with how it scales with both duration & cast speed.
Last time we got pseudo spam linger ability that could reliably leech it got quickly nerfed and for a good reason.