good question
actual, working right now features? or promised features?
for the ones working right now, i’d say the clouds and the new lighting engine, and the ground handling… i think all the rest i can live without
regarding promised features… a fully functional efb, synced to the a/c weight and balance, and paired to a functional atc, would be really a huge thing, but… when / if that happens… who knows… could very well be years