They forgot the part where you have to constantly try to get FaceID to work, and once you do, you have wave your iPhone all over the device to see if it works, then the cashier saying "I don't know if we take Apple Pay", or "it works when it wants to"
There's something wrong with your face. FaceID works instantly and reliably.
I use ApplePay every day as my primary form of payment everywhere I shop. I don't even carry a wallet and haven't touched cash in months. I double tap the side button and glance down at my phone as the cashier is scanning my items. Then tap. Done. Works flawlessly every time.