אורייתא, ברייתא and היינו are just three common examples of Aramaic words found in Gemara which are commonly pronounced containing the 'ay' (/ai/ei) sound. Of course, this corresponds to Yiddish whose custodians even employ a special digraph: ײַ. The question is: are those words, and many others, being pronounced correctly?
I'll concede that I don't ask this question out of innocence and that I'm entertaining a hunch as to the correct answer to this question. Still, I'd love to hear what other people think before I share what I suspect.