The first time I experienced a cashless store was Amsterdam in 2013. It was a fast food restaurant. Of course at first I was a little upset but it did get me thinking what are the advantages to the store
The store no longer has to go to the bank to get heaps of change
The store no longer has to take money to the bank
The store will have no money on premises so less of a target for robbery
The store will have no money on premises so no having to trust employees not to take some.
Nothing to account. Just read the total.
In almost every way, as long as there are enough customers it's a win for the store. Many customers love it too. Most of my western friends visiting Japan get annoyed they can't go cashless in Japan because they're used to being cashless where they are from.
I did run into my first no-cash accepted store here recently. It will be interesting to see how it goes in Japan as they are more privacy oriented.
I agree with all the issues of going cashless. It scares the crap out of me, especially when traveling. But, I can't see it not happening relatively quickly.