Consider this not-too-unlikely scenario:
Electric blanket gets bunched up at the foot of a child's bed, hot spot occurs, causes insulation failure and resulting arc. AFCI trips to prevent more arcing, but shuts down the Smoke Detectors as well and with the unmaintained batteries, the smoldering blanket from the first arc is now set to go undetected...
consider the more likely scenario of the AFCI not being able to recognize or mitigate a series arc.....
