Hello, @Vincentnijman
I'll affirm to the benefits of writing, you listed out.
Before I became a writer, I had always thought writing is only for those who can write a line of sentence without making grammatical or spelling mistake and I thought; considering myself graduating from science class at high school. But then I love to write most especially prose and poem. At the end, I had to tell myself that irrespective of being a science graduant, I can still write.
Now I'm proud to say I took the decision of writing daily and I can't outsize it benefits. At the moment, I have written a book whose manuscript is yet to be published. It titled "Ecstasies Through Challenges" i'm an introvert but through writing, I easily splodge my frustration and joy. Honestly, writing is a therapy.

@doris12