Paper will keep working regardless of digital methods so what's your point? No one's preventing you from using cash.
Works fine for me. Payments happen within a second. Much faster than fiddling with coins by most people.
Actually your phone doesn't even need a data connection for NFC payments. That's a huge advantage over QR payments.
QR is fine but quite cumbersome. Requires a data connection, opening an app, enterinf an amount and showing the payment slip to the vendor. NFC payments don't require any of this. Unlock your phone, hold it close to the payment terminal and done. Faster than anything else even cash.
I've been using Wise with Google Wallet for a while now in Thailand. Works great. I can leave most of my money abroad now. I convert to Thai baht in my account when the exchange rate is optimal and just leave my baht there. The less money I need to send to my Thai bank account the better.