It would be nice if a cashapp user was able to pay a lightning invoice using their cash balance. @strike just rolled out that feature and I confirmed it worked by sending $1 USD from strike to pay a cashapp lightning invoice, and satoshis landed in my cashapp account immediately. I believe this would remove some friction and the use of btc is invisible to the cash user, but the receiver of the payment still gets the funds the way they prefer. Win/win