I paid for a meal with Bitcoin recently. The place was very modest and they just had a WoS QR code glued to wall. When I told the old woman at the cashier that I wanted to pay in Bitcoin she just told me the amount and trusted me to type that on my phone and trusted that my wallet would know how to convert that into satoshis at a reasonable exchange rate (she didn't know anything about Bitcoin I'm pretty sure).

Can't we make this better? There could exist a device with buttons where she could type the amount like she did with the credit card machines all other customers were using. She would just press the amount there and handed me a QR code to scan with the amount included, and exchange rate conversion done at some server trusted by the restaurant, it could be fully offline.

I'm just saying this because I was amazed by the fact that so many years have passed and I barely hear about these kinds of issues or the solutions to them. Makes me feel that no one is thinking about the problems of grassroot Bitcoin commerce adoption, which is the most important thing.