Exactly, the corrupt path is mostly drawn by desperate, weak and unprepared MAs, that's why it's understood as a path of shortcuts. But when outlined by the "elite"(OG/Scholar Taio, Thunderfaller...etc), the corrupt path and its branches(Blood, Death and Demonic) are to be studied and specialized in just like any other.
A tri specialized corrupt Cultivator must be madly strong, seeing OG Taio and the Death-Lords of New Yomi.
Speaking about the Death-Lords(Don't know how to ping someone

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Anon once said the strongest Death-Lords of New Yomi have the potential to ascend too, so I wonder if the Heavens accept some corrupt cultivators(If the corrupt cultivator isn't that much of a son of *****), or if Anon was just talking about their potential overall, like, some Death-Lords being able to match the S-tiers of Rasen, Ryugujo and the Infinite Plains.
I usually don't want to talk deep about demonic Cultivation because it would make it looks so bad in in long run but you are directly asking so here we go.
They(New Yomi's death lords)don't they cannot ascend it was about being among the strongest of the world they are still weaker compared to top Dragon princes,wild gods,Top people of Rasen and other powerhouses the people of new Yomi have mutation that they don't need any help to maintain control over themselves.They are hard to kill that is their best attribute no one is more of an Elite demonic Cultivator than them not Taio or anyone unlike taio they don't need to have extra prep afterall.But this isn't the real issue of demonic cultivation.Also the taios mock new Yomi's people for thinking they can retaliate against the heavens they are delusional lol the taios say so aswell Demonic path is for the weak even the "elite" version of it Unless you are from New yomi because then that is your basic way of cultivation.You either are weak or you are basically a scientist Taio is probably both.
Now the real cons of demonic cultivation are
1.The ap you gain is temporary it dissipates after a certain amount of time has passed the demonic ap is more a fuel.
2.It is like a drug you need more and more corrupted ap each time
3.The "immorality" of it is the worst the weakest one by far as you only need more and more corruption each time as I pointed out.When you reach the point of power where you make your personal hell basically your only way to live you cannot ascend lol and if you stay on the planet you are gonna get smited by some new heavenly clerk.Mind you the planet's strongest can still kill you if they band together so yeah this is the peak of demonic cultivation.The issue with this is even if you make a whole civilization of proper hell for other demonic Cultivatiors and get enough corruption there will come a point where you will need to consume so much that you need to attack the planet which means you will have to leave you hell.If you don't you will die anyways as the requirement has gotten so High and when you do get out to get fuel you get culled like an insect.
4.The power difference is insane the strongest demonic Cultivator who made his hell is still vulnerable to the people of the planet and an insect to even the newest of Ascended.The only reason they aren't culled in their hells is because these hells are basically connected to the planet and Ascended cannot come there themselves as they would just break the planet in two nor can they smite there because it isn't directly there.
Now one would think then why doesn't heavens cull them when they are still on the planet and not that strong, heavens doesn't interfere till the person on the planet has hit their cap it is about free will same way why evil dudes without demonic are still there and only get the belt or smite when they have hit their ap cap and do some heinous ****.
So yeah Demonic cultivatiors are no predators their peak is to be smited by a newly Ascended guy who just have been given the job to take care of some planet.
It is why it is the path of weak you have no real future.
Kuro can get memories, face, experience of someone else like demonic guys lol you just need to be High level for it.
Demonic chi is just rotten cursed chi like literally.
Kaito can provide way better immorality already a real one aswell and we don't even need that one as any great Cultivator will reach the point where they can ascend but yeah kaito's foundation would be a boon for someone who has weak potential but all the determination like getting enough ap in Maybe 5000 years lol.
Anon allows sub par paths and dumb decisions because he wants people to have freedom and hey demonic Cultivation content is funny lol.