Ash
Trouble....
What is your experience with hairballs?
Absence of evidence is not evidence of absence. Chins can and do get hair balls. No they cannot throw up but no, the mass does not necessarily pass through. It can and has caused blockages. This is in spite of Alice Kline's lack of finding and all the so sure of themselves people who categorically proclaim it can't, doesn't and will not happen.
The interesting question is why. But we can't discuss something that doesn't exist, now can we?