thanks for actually starting a discussion
I think the main difference is that demon gives a technical boost (insane aspd) and has a technical drawback (dont think anyones kill speed wouldnt be affected by perma-blindness)
Frenzy on the other hand gives a similar boost, but the main drawback is a social one that doesnt affect your actual fighting abilities (since you dont get distracted that much it can even be better with frenzy)
I dont see why that is necessary,since frenzy does have enough technical drawbacks (mainly no skill usage cripples the user badly)
Can i read from your and shinigamis conviction that this has already been proposed and denied