Being born in Stockholm, I always heard "jag" pronounced as "ja." People are lazy with languages because the minute details aren't necessary. Just like how all the forms of "them" in swedish are pronounced "dom." Considering that I have lived in South Carolina for the past 12 years or so, I can say with certainty that English is close to the worst with simplification.
German has 2 words for the fruit orange. Orange (obviosuly) and Apfelsine.
"The Low German word is Appelsin (from where it spread to Danish and Norwegian). It is therefore clear why a Northern German would regard Apfelsine as popular and Orange as posh. I suspect the origin is Dutch where appelsien is a variant of sinaasappel (Chiana apple)." - https://forum.wordreference.com/threads/apfelsine-vs-orange.1329938/