I'm sure virtually everyone would like to know about everything if they could. But they know they can't; they have to make choices about how they spend their limited time. So they would be delighted to learn about TVs and computers and VCRs if they could upload the knowledge instantly into their brain like in The Matrix; but they can't. So they focus on what particularly interests them. Some people prefer to learn about Japanese post-war cinema. Again, I'm sure most people would love to learn all about that if they could do so at no opportunity cost. Just based on the specificity of the subject I can guess that you are not particularly interested in Japanese post-war cinema and will not choose to learn about it in your lifetime. But that's not sad. No one can learn about everything.