I still think that the possibility of infiltrating an enemy's protected territory, metamorph abilities and social skills combine too well to just ignore them. Gather rumors, destroy friendship, pour poison and get caught on camera and this is only a small fraction.You are describing a difference of 1 or 2 dice as if it will bring about total failure. Attributes at 2 instead of 3 are not incapable, it's a marginal difference of one die. And it's not "anyone in the building will notice us" just because we lack invisibility. Normal stealth matters.
Also if assassin games have taught me anything, it's that you haven't really broken stealth if you can kill people you come across before they can raise the alarm. Which our already existing affinities will help with.
I don't agree that the alarm suppression is lost by including other people; there's probably a range limitation, but not everyone in a heist needs to do the same things.
This is a common misconception about social maneuvering: it's not actually that difficult to raise impression mundanely.
You can get to excellent impression by having a decent approach and passing a social roll - something we will be very capable of. Pusher means that we are very good at increasing impression in any of these builds. We will regularly be able to get social maneuvering down to hours, and will be able to sometimes get it to Perfect without magic; Familiar Face speeds things up because it lets us skip prep and do less homework, but we can be very persuasive without it.
I didn't say that the skill turns off in the presence of other people, it's just that the ability to be invisible only affects the user, nothing prevents the alarm from noticing the rest of the people who came with us.
(and her actions never causes mundane traps or alarms to trigger unless she so desires.)
As for social maneuvering, the search for the vices of the goal alone and then their implementation can stretch indefinitely, because desires can be anything. And with the help of a familiar face, we can immediately proceed to the issue without wasting precious days searching for nonsense for the next politician. In addition, with the help of a familiar face, you can use fleeting chances, for example, a person came for a short time or we need a person to do something immediately and there is no time to fulfill his desires. In the end, our character is a manipulator and a familiar face eliminates one of the main disadvantages of manipulating ,time.