Pronunciation of Yiddish/Hebrew is not according to the so-called “Gefilte Fish line” because while part Polish, Lithuanians, Ukrainians and Russians Jews may have enjoyed their gefilte fish peppery and while the part Polish, Hungarian, Checkoslavakian, Austrian, German, etc. Jews enjoyed theirs sweet, it has nothing to do with the pronunciation. Only Hungarian Jews and many Galician Jews pronounced the vav as “git” while everyone else pronounced it as with the original “gut”. After the war when most of the Chassidim left alive were Hungarians, they had a big hashpuah on many other Chassidishe who were the ones that did not drop the Yiddish language, and today majority of Chasidim pronounce the vav as “ee” besides for in Israel where they the “ee” pronunciation is not as widespread even among Chassidishe. It seems as if the Hungarian pronunciations of vav and yud as “ee” and tzeirie “aih” as in laihn (lein) are more recent adaptations influenced by the Hungarian language as opposed to centuries old because they have not infiltrated pre-Holocaust Israel.
There’s nothing wrong with spelling phonetically but using the “vav” correctly instead of a “yud”, doesn’t have to do with so much with phonetics as both letters are pronounced “ee” by a vast majority of Yiddish speaking Chassidim. It is more that they are simply not knowledgeable of the original Yiddish spelling. In fact, spelling words correctly with a vav instead a yud is also spelling phonetically because originally the vav in yud are distinctive but and spelled accordingly but not in Hungarian Yiddish/Hebrew where the pronunciation is the same and so the spelling is interchangeable to whatever one feels like using. And it doesn’t matter. As I see it, every single living language has evolved whether it is in pronunciation, evolution of words, spelling of words, grammar etc. The Yiddish spoken today is one of the least evolved languages so exchanging the yud and the vav doesn’t bother me.