quoted

Yes, my wording was a bit too strong. It is possible, sure. Yet, I
understood that one of the features of I3C is to have in-band interrupt
support. We will see if the demand for backward compatibility or "saving
pins" is higher.

Indeed, you can use in-band interrupts if your device is able to
generate them, but that doesn't prevent I3C device designers from using
an external pin to signal interrupts if they prefer.

Exactly. Thus, "We will see if the demand for backward compatibility or "saving
pins" is higher" :)