As someone who filled out multiple copies of the same contract by hand to buy a house recently, which had to be stamped with my seal and not signed, AHHHHHHHHHHghgghhg. On average, I only have to fax something once every several years. NTT, the main telecoms provider, STILL requires that you fax paperwork to get internet (at least for NTT East as of two years ago).

Using cash is great (except for my airline miles account), but one of the biggest banks in Japan is notorious for outages. ATMs here also, until very recently, had business days and hours. That's finally mostly gone, at least. They can still run out of money at the year-end holiday season as everyone is home with family and they're not always restocked in some locations, but more ATMs also helped to solve this. The problem with things transitioning to electronic payment is also those payment processors take a cut. We have all kinds of payment apps here, but many small businesses I know hate using it. The ones I know that use it most generally have larger foreign customer bases (anecdotal to business owners I know; may not be generally true in all of Tokyo/Japan).