Since Islam seems to be pick and mix, why bother annoying the entire community to interrupt the sleep of elderly people and babies at 4am with 115db foghorns. Why not just say 'get up if you want to and put an alarm clock on if you feel strongly about it'. The practice of using mosque loudspeakers is definitely not halal, because it purposely and knowingly damages the health of vulnerable people, so I hope those speakers do not get a halal certificate.
No other religion has such a plethora of rules which cause such harm. Surely it must be time to reconsider the way it is designed.