You seem to be missing the downside of the Sight that whatever you look at with the Sight ATTACKS YOUR MIND. Harry risks driving himself nuts every time he uses that ability.
Opening the Third Eye does attack your mind.
Arcane Senses and
Wizard’s Touch do not - at least not according to the description in the pre-order text. It seems like a bit of a cheat to claim a
rebate because one of the trappings of the power has a down side
only if you use it.Even if my comparison isn't valid and the two powers are balanced it doesn't change the fact that there are not a lot of examples of Supernatural Sense in the books; He Who Walks Behind, Temple Dog, Sigrund Gard, Morty Lindquist, Maeve and they are all Strange Senses [-2] except Maeve, which claims to be Strange Senses but is only [-1].
There are no examples of Strange Sense [-1] (unless Maeve's "Strange Senses" is a misprint) and definitely no examples of Broad Senses [-3]. Broad Senses has a high cost! Is better than Ritual( Divination), only [-2]. Or is it equivalent to Thaumnaturgy Divination (=Investigation) and Wards (=Alertness), which would also cost you [-3] and get you a lot more bang for your refresh!