It's amazingly fractured actually. In my home country every store pretty much has the same exact model of a card reader that takes all contacless payments and credit cards with chips. In Japan it's a coinflip wether a credit card reader can take contactless credit cards. And if you do it with the chip, it's always a fun process of the clerk not understanding you need to insert a pin or select a currency, so they sometimes abort the process in confusion.
Needless to say, I prefer to use cash in Japan.