30 kg on the tail would be a sizeable CG change - we used to put 10kg there to counter a massive camera on the nose. Without a camera, and 30 kg on the tail - fuggeddabardit!
Automatic engagement just invites undemanded deployment - that would be exciting.
No use for it, other than the 1:1million chance of a tail fail - no thank you, rather have 30kg more payload and a workable CG for the 999,999 other flights.