No problems at all, either of you.
The distinction, as I see it, is that concentration is required to use Auspex - the vampire chooses when to use it, and it's a power, rather than a 'side effect'. With 'passive Presence', it's a matter of the vampire not having anything approaching active control over the target, etc. (which is why I proposed the house rule for your scrutiny.. note the shift to an (expensive) ammount of control over its use which is at the centre of the idea). In the same way that it's not an offense against the spirit of Elysium to be an attractive person, it isn't to have Presence and be, well, an attractive person. On the other hand, snooping on others is quite against the notion of neutral ground (note, always, that doing something and getting caught are very, very different things).
Likewise, the 'active' use of Obfuscate can be permissible on Elysium for some reasons (Nosferatu concealing their hideous visages, for example) and yet not for others (hiding to spy on others). Mind you if they're doing it, they've likely got away with if in the case of Obfuscate, so perhaps it's not the best example.
Note that Animalism, Dementation and Dominate have 'passive' features as well, varying in usefulness and subtlety.
Regards,
Barry