The Maharil says we’re not Makpid on pronunciation. And he’s talking about Mileil and Mil’ra, which can have a much bigger effect on meaning.
Yeah, people mispronounce words. Even Shem Hashem. At absolute worst, a consistent mispronunciation means you just created a new dialect. Who cares? If you say Shem Hashem wrong, at absolute worst you made a Bracha B’la’az. So complain about mistranslations in Duchening. But saying that mispronouncing Hashem’s name makes an Amein said to such a Bracha is an Amen Yesomah is just pure Amaratzus.