Examples, you want to buy banana on the way while driving from a hawker, will you use bitcoin to pay the bananas? Because the way I am looking at it, it is possible but the delay in transfer is the concern here. Bitcoin transfer is not like the bank transfer in which we received instant allert within 2-3 minutes time. I know some people will say set the transaction fee high then you can pay whatever you are buying with instant alert.
Why would you be paying a banana seller with Bitcoin, when you can just give them cash and be on your way? Let's say you're on a public transport, and you're not the only one on-board, you're not going to start wasting other people's time buying banana and pulling out your phone to start asking for seller's address, and in worst case scenario, there happens to be a slow network issue, you would end up wasting everyone's time, when you could have just pull out cash and hand it over to the seller, easy.