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One may be able to read without being able to speak, or even without being able to understand speech. And inversely. It's also a lot easier to passively understand than to express oneself
Another interesting distinction is the one between freeform writing (pen & paper) and selection-based writing (using a keyboard). It takes one order of magnitude more time and memory capacity to learn to write Japanese or Chinese on paper that to type the exact same characters
In the future it's likely very few people will still be able to freeform-write these languages. Even if they keep painstakingly teaching these skills in school, people will forget them quickly enough afterwards due to a lack of usage
I'm trying to learn japanese now and feel I'd learn it better if I were forced to also handwrite 
Typing Japanese on a keyboard is not good for your memory retention.
There is also an emphasis in hand writing practices. In fact, you are often judged by your hand writing in eastern culture.
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