Eventually, it turns out that pilots got confused as to which horn meant what. Something had to be done! The solution was ridiculously obvious - the horn sounds were speech saying what is wrong, like "stall! stall!" instead of "toot! toot!".
I think about that whenever I deal with a piece of machinery that emits random beeps to warn me about something. Like my car. Really, how hard is it to say "ya left ya lights on, ya fakking slagger!" so I would know what to do. At least my navigator says "recalculating" when I screw up, although I prefer "ya shoulda turned back yonder, ya witless wanker!"
Though I do wonder why they never put me in charge of the warning horn design.