actually, I do this a lot. I often have difficulties speaking what is on my mind. Even during face to face interactions, there are times I will pull out my phone and type a message instead of speaking it simply because I can be much more precise in text than I have ever been in talking. During meltdowns, this is often the only way I can communicate because I go mute. It is like my brain-to-mouth interface just decides to stop working altogether.
In addition to being easier to communicate, typing out things like your thoughts or feelings quite often helps you understand them yourself. Something about dumping them out into a visual format to be able to sift through them makes understanding thoughts and emotions a lot easier... for me, at least.
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"Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind."
-Dr. Seuss