Boeing found out the problem with "beeping" alarms.

The first time they installed a warning horn, I think it was the stall warning, it was a big success. So, they started adding different horns for other situations. At one point, in an emergency, the pilot got confused about which horn meant what, and had an accident.

So now, Boeing replaced horns with a voice, like "pull up". Sounds obvious, right?

But car beeps generally give no clue what they're beeping about.

Decades ago, I wondered why elevators announced floors with a beep. If you're blind, you have no idea what floor you're on. I thought a voice would be better. 50 years later, I heard some elevators announce the floor with a voice.

P.S. It's not a technology issue. The IBM PC had an I/O port wired to the speaker. You could give the speaker +5V or 0V, making a square wave only, an annoying buzzing sound. But then some genius discovered that if you ran a wave form through a clipper which gave a sequence of 1s and 0s, running that produced quite a credible voice sound.

P.P.S. My furnace gives its status in the form of a blinking LED. A fast blink means broken, slower blink means A-OK. Of course, when you're faced with a blinking LED, is it blinking fast or slow?