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The way one uses language at home is extremely narrow compared to the range of ways one may use language in the outside world. Hence kids who grow up bilingual but don't use their parents' language outside tend to have a very limited command of it
Speaking a language is not a binary, it's a multidimensional spectrum. Not only that, but speaking, understanding speech, reading, and writing are all distinct skills, and while they're highly synergistic, they overlap a lot less than one may think
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
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