harry
Yes ... and no.
Fatigue reports are reactive, if you really felt tired and under performance par due to rostering.
However I still regards ASRs as something not only reactive, when as you state we made a mistake due to fatigue, but just as much proactive, when a pattern seems blatantly flawed and fatigue most probably will happen.
Proactivity is a distinct characteristic required to get the fourth stripe, and it includes proactive ASRs.