Some of those are broken some not so much, if they ever get too out of hand they will be nerfed hopefully. Note Tickatus wasn't nerfed despite being OP and hated, so the blade cuts both ways. Neither were some other OP warlock tools. Anyway I don't see much point in further debate, I look at individual cards and I see Warlock ones are considerably bonkers, probably most OP class pound for pound. It is just that currently the other pieces of the meta work against Warlock, if you buffed it to overcome those then there would be nothing to stop it, it would be T0. That is my read of the situation and seemingly Blizzard agrees.
I hope things work out for you m8, consider trying out some other class for a bit.
Obviously, but the point of that is not that Warlock, esp. control Warlock, deserves buffs but other classes deserve nerfs, and for Blizz to reverse the gear on powercreeping cards. Just compare classic cards and the ones from last 1-2 years, it's crazy.
You are heavily invested in Warlock, and I get that, we all have our favorite class. But you would probably be well served if you branched out to other classes so that you are not so hard hit when Warlock is not strong in the meta. I agree with PetiteMouche (I think) that Warlock is ridiculously strong, just not strong in this meta. Eventually the meta will shift and Warlock will have its day. If we did what you want and just buffed it buffed it buffed it until it broke to the top it would be absolutely insane because then it would be strong despite the meta and that would make it broken on a level we haven't seen maybe ever. It would be strong in the presence of things that are meant to keep it down, classes which aren't would just die, I am not sure if meta could even compensate for such a buffed up Warlock. It's not fair and it should not happen.
Consider all the ridiculous tools available to Warlock, soul shard cards, corrupt cards (including hated Tickatus), Jaraxxus and a ton of others. Warlock has so many potentially bonkers cards is hard to list them all. This deck is 100% poised to take over the meta, it will almost certainly happen, just not yet. And indeed Blizz is aware of this and has to make sure when it happens it's not too disgusting.
The issue with Hysteria is that it's a double whammy. Because if I play around Hysteria by having equalish minions so none can gobble up all the others then you get hit hard by AoE. If you play around AoE by having some stronger minions who will survive it you get hit hard by Hysteria. It is just an exceedingly annoying card to face, especially against Priest. It definitely deserved the nerf and I'd be quite happy if I never saw it again. Sadly it is too good to cut, which ofc just further shows the nerf was very much deserved.
As for the debate going on, warlock has some beyond bust cards imo. If it can't win with those then it is not warlock that is weak but everything else that is nuts. Powercreep really fucked this game hard since I left.