there are safety issues associated with false alarms
Unfortunately
the cause of a false alarm is usually not known
Regulations mandate that the alarm sounds within 1 min after the onset of a fire condition
Pilots may have only about 10 or 15 min in which to land before smoke or damage to the structure from an uncontained fire prevents the pilot from controlling the aircraft.
Reducing the time to alarm will allow the pilot to suppress the fire at an earlier stage and permit more time to land the aircraft safely.