So now you have ecash from two different mints. Like cash from two banks, redeemable for BTC at the bank that printed the cash. You can send that ecash as lightning for invoice payments or zaps. You can send it as ecash through any medium that can support a QR or text (ham radio/Meshtastic/messenger app). The bearer of the token owns the ecash. It can be sent/moved physically, offline. I can print a QR code and throw it out the car window for some lucky pleb to find.

Using ecash to transition in and out of KYC BTC is something else you can do. Open a LN channel with BTC, then send sats to the ecash mint. Do whatever you want from there. I'd say privacy is pretty freaking good. You can even run your own mint for friends and family and mix all that in.

You CAN be rugged. But also by WOS or Strike or Alby or whoever. 

I'm not saying it's a Monero replacement. I'm saying now you have a hammer, a screwdriver, AND a wrench in the toolbox.