The goal of BTCPay server is to use the Lightning Network for Bitcoin payments, which only generates single-use payment requests. Also important to point out that LN will not be functional for years, so...
You seem to be misinformed about this because LN is absolutely functional today already. What are you talking about?
Is it not functional in BTCPay server perhaps? Nevertheless, the network itself functions already and functions well. (Adoption will take time to spread, yes.)
"Absolutely functional" is when a user can send+receive a payment as effortlessly as Venmo. You cannot do this with LN at any time in the near future - routing payments, automatic channel management, sending a push payment, etc. I don't mean to bash LN but its simply disingenuous when people suggest these features are anything but pre-alpha
It's already functional and live in production for many business today. It will just keep getting better, e.x. enabling LN payments without an invoice from the person accepting the payment.
Is it not functional in BTCPay server perhaps? Nevertheless, the network itself functions already and functions well. (Adoption will take time to spread, yes.)