Cash is a great answer to a whole lot of basic commerce, small scale, freedom style, between adults just adulting.
The problem IS businesses refusing cash. The public really does not benefit and we have not shown we are able to avoid abusing electronics.
One day maybe. Right now? Not a chance.
Cash remains necessary and the costs are not crazy enough to warrant all the abuses and risks other payment forms bring to the table.
I do not connect payments to my phone for example. Everyone I know who did has a story to tell about how doing that cost them.