No its not a bad copy and while it can be optional, it doesn’t have to be. You can do a one way bridge. It effectively gives an alternate L1 for Bitcoin making the base layer NOT transparent at all with zero amounts and zero addresses shown. This scheme has nothing to do with Blockstream and while Peter Todd first spoke about CSV, this fully private CSV scheme was envisioned and built a decade later by a different group of people. Clearly you have no idea how the protocol actually works. I suggest you actually read the whitepaper and dig-in before responding.