If you enjoy aviation podcasts, check out The Corporate Pilot Guys Podcast which I am a part of with another corporate pilot: open.spotify.com/show/3CGTyNGt0hGG9nlSDElOlj
My guess is so the airplane could actually be flown on the edge of a stall where any change in angle of attack or load factor would cause a stall. Flying with the stall buzzer normalized the sound of a stall buzzer which would be like hearing a smoke alarm going off and doing nothing.