I come from an era when those who were trained as teachers, had to model correct speech to students. This included pronunciation, enunciation, word choice and usage and overall clarity. Part of our training was that speech imperfections (ie ‘rabbits sun wing awound Wocks’) had to be overcome before graduation. For those with speech and speaking challenges, corrective and elocution sessions were offered. They were free and compulsory. It was deemed that teachers who were to teach students, had to example correct speech and speaking.
We have moved a long way from those days, but I still think that what we were offered was invaluable.