As near as I can tell, you don't like the adjective that Niall picked to describe Darius' low Presence. As near as I can tell, you would prefer that Niall chose a different adjective. But, the term "frightening" is just window dressing for a -3 Presence. It's just an explanation for why Darius faces a -3 on Presence-based rolls. But you can't wrap your brain around how "frightening" can be a negative. In your mind "frightening" can only be a positive.
No one in the entirely of this thread has made that argument except you in the straw man that you've set forth. In fact, we've all acknowledged that Darius should suffer a-3 to his Presence-based rolls. Your straw man is the only proponent of making a-3 Presences give a+5 to Presence-based rolls.
Unless you're talking about your odd interpretation that a character with a -3 Presence should be spit upon while a character with a 5 Presence should be given everything that they ever wanted just because they ask for it. Speaking for myself, that interpretation gives far too much weight to Presence above all the characteristics.
In my view a -3 Presence character should suffer penalties to any Presence-based abilities, as per the rules, and could potentially suffer some minor role-playing penalty for having a low Presence, but should be just as playable as a character with a -3 Dex or a -3 Com. They should not be ostracized or ignored just because they have a low Presence.
it seems to me that it sticks in your craw that some of us believe that a mystery cult might want to initiate a -3 Prs character the same as it might want to initiate a +5 Prs character. It seems to me that you elevate Presence above all other characteristics and appear to forget that Darius and your hypothetical +5 Prs character are both made with 7 characteristic points, 10 points of virtues, and 10 points of flaws. In theory, the two should balance out and be about as effective overall as each other. True, one will be better in some thing than others. Darius, in particular, is better at destroying things than in talking to people. But overall, they're about the same power level. However, as near as I can tell from your arguments, you believe that the +5 Prs build that you propose is inherently better than the -3 Prs build NIall came up with for Darius. And that's something that I can't agree with.
ArM is a point-build game. Each character is made up of the same number of points and should be roughly the same power level at the same hermetic age. Different characters will have different strengths and weaknesses, to be sure. And not every character will be the same in every situation. But overall, they should all have a place they shine. Darius is bad with interpersonal interactions, but good at destruction. A mystery cult might have all the talkers it needs and instead need someone who can destroy things. In that case, it might prefer Darius over another high-Prs character.