You pick on them, but you seem to have missed a major reason why Vanya and Sonya haven't had jobs and had to rely on Masha's income. They were taking care of their ill parents. You don't mention that anywhere, but it's a major point of contention between Sonya and Masha.
This is a sad excuse for a "review". This show has nothing to do with race. You fail to mention that although Cassandra was played by a young African-American woman in New York, the script specifically states that the character can be played by an actress of any age or race. This is an incredibly sweet and funny show. What's offensive is that you've intentionally tried to turn it into something it's not. Shameful.