[timoth]

Indeed. Or even native speakers speaking our native language. A fond memory of mine is having to translate a Glaswegian colleague when we were on business in Kentucky. By which I mean I basically just repeated what he said in my "standard" English accent for the benefit of a couple of locals we were talking to, because their reaction when he first said something was along the lines of "Hell, I didn't understand a word he just said!"

[YeGoblynQueenne]

That is a well-known effect that has nothing to do with speech recognition:

https://www.youtube.com/watch?v=oLt5qSm9U80