The other week, I went for dinner at a place that had a online ordering system. My experience was as follows...
Arrive at the table, scan the QR code
No phone signal in the restaurant, so I need to connect to the wifi.
Connect to the wifi, get a captive portal
Need to put my phone number in to connect to the wifi; there is no signal, so I need to go outside, to receieve the confirmation code.
Connected to the wifi, scan the code again, choose my food.
Go to pay, need to register an account
Put my email address in, I already have an account on this food ordering service!?
Do a password reset
Put in my credit card details (why not use apple pay?).
This whole time, we're sat at a table, in theory to meet friends, but we've spent the first 15 minutes all glued to our phones!