A large portion of the population is already familiar with bitcoin and its price in dollar terms. Suddenly shrinking that by a hundred-million-fold is going to be nothing but confusing. "Yeah, you saw bitcoin was $100k each last week, but now it's just a tenth of a cent. No, no, it's not because there was a price crash, it's just because we changed the definition, you see." By contrast, saying, "just like there are 100 cents to a dollar, there are 100 million sats to a bitcoin, so it's usually more convenient to talk about sats than bitcoin," is not at all something I've ever had difficulty getting across to people in my 10 years of using and explaining bitcoin.