It is my understanding that during development if it is found that the aircraft has certain "undesirable" characteristics (may require exceptional skill) from the pre stall buffet (if any) through the stall break (if any, Controls may reach the aft pitch stop) that a stall recognition system can be installed. These would include big red signs, stick shakers and stick pushers.
The undesirable characteristics would be a roll exceeding 20° (wings level stall). The stall itself cannot be violent or extreme or needing anything but "normal piloting skill". A stick force per 'g' reversal or a reduction in stick force is usually a no no.
So they can add say a stick shaker if there is little aerodynamic warning and a stick pusher to really prevent the stall and send the message to the pilot that a recovery should be initiated when the actual stall will be "exciting". Delta fins usually are used to during power on (1.5 time the power to maintain level flight with landing gear extended and flaps at approach setting Vsr1) stalls where there is not a clean enough break or sufficient downward pitching moment through the stall.