CTarian on Nostr: Maybe I'm just a simpleton in my thinking but, if a business person had a phone with ...

Maybe I'm just a simpleton in my thinking but, if a business person had a phone with his business lightning wallet, why couldn't he/she just offer to sell goods and use the phone & the customer's phone to consummate a trade? I understand the idea of a point of sale system on the counter, but is it really needed? Especially in the local setting where the customer & business owner may well know each other? What am I missing. Does the business need to run a node? Maybe not, right? Or is it all about the gov't regulations screwing things up?