"if you can't act a role, I don't care how well you sing it" -- theater fan
"if you can't sing a role, I don't care how well you act it" -- opera fan
"it depends" -- the huge continuum between the extremes of the two above
(And I fully agree that most musical theater roles are not written for Opera voices and vice versa. And yet, the occasional cross-over successes delight like a just as improbable lightening strike.)
