In Japan, home computers never really made sense until it was far, far too late.
In the west, you'd buy a PC (or a home computer) to play games, edit documents or manage your business. The latter two were pretty much impossible in Japan, as the computers of that era couldn't handle the complexities of the Japanese language and character set. Gaming was all that remained, and if you only wanted gaming, you could just as well get a NES (known in Japan as Famicom), which was much better suited for the purpose.
Computers eventually caught up, but some of the cultural impact remained, still making them less popular than in the west.
This is one of the reasons why Japanese were so good at consumer electronics, they just needed that electronics a lot more than we did, and the devices needed a lot more features, as "just plug it into a computer to do the complicated stuff" wasn't really an option there.