My problem with "just writing" is, that I tend to ramble sometimes. And there is a difference between articulating a thought in a structured way that is comprehensible to readers or just writing on and on about a complex matter where I get new ideas and those new ideas get me thinking more and spawn other things and then I still have other themes that I need to adress and that lag a good crossover now (because of the new things that just kind of evolved while writing).