One of the reasons Pix took off as hard as it did is because the incumbent instant payment system (TED) only worked during business hours. It basically got digg'd once a 24/7 free service came around to replace it.
Pix is great as a payment method for the average person, you use it to split a check and pay for your Uber, but big money still flows mostly via TED and other means.
I'm far from an expert or even knowledgeable about finance related matters, but isn't one of the things HN (in general) fearful of with respect to CBDC's the centralization aspect with the government. How is this any different, if any?