I don't understand your point, you're trying to make complexity out of simple concept imo. Data science: the science of using data to draw conclusion. Can be t

I don't understand your point, you're trying to make complexity out of simple concept imo. Data science: the science of using data to draw conclusion. Can be thousands/hundreds of datapoint. Can be billions. Does not matter. Big data: subset of data science applied to "big" dataset where the most trivial approach reach their limit. It does NOT mean billions of datapoint easier, it probably just means that it is not well suited for a spreadsheet anymore basically.