I was reading a book (1) which talked about that and emphasized the importance of writing on formulating thoughts and ideas. The funny thing is, it seems it has less to do with writing being some magical input method that makes you think better, and more to do with the fact that writing is just plain slow and forces you to think through and sort of sum up your thoughts as you go. So ironically, it being an inefficient method actually has a positive! But I still feel like you could get most of the way there by just being more deliberate when using a different input method, for example, forcing yourself to stop and think as you type, or using outlining tools, or maybe even artificially limiting your input speed...

(1) "How to take Smart Notes" by Soenke Ahrens