I’m sure it seemed like a good idea at the time, but it hasn’t caught on has it? Why on earth would a hiss like escaping steam be more effective than a peeping noise which we all recognise? Similar thinking presumably led to the replacing of the old ‘nee-naa’ sound for police cars with the ghastly American-style wailing. By giving up the Doppler effect it made it nearly impossible to tell where the sound is coming from and if it is approaching or receding.