It's not even a question of AI. In the past epoch, when we used to own (rather than rent/subscribe to) software, it was common to use desktop apps such as Dragon Naturally Speaking. They didn't pretend they could do a great job out of the box - the result would be just like you get with Google, Amazon and the rest. In order to get good results, you needed to train it first. It didn't last long, but after that it produced exactly what you said (with exceptions like less usual proper names etc.). I wouldn't ever accept the quality of all these "modern" transcription APIs, they look like a step backward to me.