i definitely agree with a lot of this.
however, i'd also argue that the other 80% of input does definitely have it's value! for me, that's learning new things about theory, production, and collecting inspiration. while the actual songwriting process only takes up a short portion of your total time, there's a lot that goes into it behind those sessions.
also question for y'all: who is your article is targeted towards? at first it seemed more helpful for someone trying to "go pro" with their music, but now that i think about it i wish i'd had that discipline since day 1 haha anyway good article, thanks for sharing!