I like henrik's answer.
There isn't one universal accent or way of speaking and singing for all characters in musical theatre. If the "modified vowel" choices serve the material, I don't care in the least.
I also admittedly give a "pass" to the old-school larger-than-life stars and always have.
Ethel Merman in Annie Get Your Gun
The Cowardly Lion with a Brooklyn accent in Wizard of Oz
Marlene Dietrich as a saloon gal in Destry Rides Again
Hermione Gingold as Eulalie McKechnie Shinn in The Music Man
They all made it work beautifully.
"Jaws is the Citizen Kane of movies."
blocked: logan2, Diamonds3, Hamilton22