A lot of those inefficiencies exist for the purpose of maintaining the employment rate. They succeed at that.

While a lot of those practices are clearly inefficient, let's not forget that they have their plus as well. It is sometimes madening to see consensus building in Japanese meeting, but people are less likely to be blinded by their limited understanding as well. I can't find the reference, but a former colleague of mine knew of some research that showed how Japanese were more likely to know the actual decisions being taken after a meeting compared to their European/American counterparts.

Also, caring about the content of the emails or doing faxes means you are not as likely to answer them with a two letter words, which is just being efficient at doing useless things I suspect the fax thing itself to be more of an artefact of the average age of people in charge in Japan: my gf parents had a fax, but nobody I knew in my own generation in Japan had one. There is also most likely an early adoption paradox.

In the end, Japanese economic woes are mostly demographic I am afraid (GDP growth per capita is closer to the US than most people think), and inefficiencies should be considered with that in mind.