Whether this applies depends on what situation you are supposedly replacing by writing. If you replace intense IRL dialogue and discussion, with writing, this

Whether this applies depends on what situation you are supposedly replacing by writing. If you replace intense IRL dialogue and discussion, with writing, this might be the case. On the other hand, if you replace just letting your thoughts fade in the void, with writing them down as coherent though out ideas in writing, I would argue that the writing has actually both triggered retention from memory (thus exercising the memory), and helped you critically assess and make your own thinking clearer. Thus, I think writing is an extremely helpful tool for processing your thoughts for most knowledge workers who are not already involved in constant dialogue with others (which is most of us I guess).