Does Weak Enchanter flaw apply to reagents/ligatures/inceptions/theriapics from Art & Acadame? Does it apply to longevity rituals?
I'd read it strictly. "Your Gift is ill attuned to creating enchanted devices."
The items you mentioned aren't enchanted devices.
Does your troupe want/need them to?
Please note that if you allow a Learned Magician to take this flaw, it probably should.
No, it is not a device.
It does not apply to effects invested into the familiar bond either - while the mechanics are similar, the nature of the bond is distinct and very different from a device.
These are not enchantments. They are not even magical. So the Flaw does not apply in my opinion.