Why is it important to understand the multi-faceted nature of the Jewish diasporic experience?

Why is it important to understand the multi-faceted nature of the Jewish
diasporic experience?
How did the image of ‘the wandering Jew’ begin? Does it still persist?
If so, why?
Has the expansion of the term ‘diaspora’ beyond its common original
reference to Jews, now gone ‘too far’, with the effect that the idea is losing
its force?