Sergey, you are NOT full of shit (lol).
BOTH the advice of writing more, and the advice of writing less is equally valuable. First, you have to write a lot, because you need to gain following and improve your writing skills. I remember you saying it's important to improve what you produce by 1% each day, and that's a valuable advice.
And then, you can sit back and relax a little bit. And write less, but invest more time into each peace.
There is no white or black here; it's all GREY. And grey represents the mix of two: write more at first; and then write less.
You're doing a good job, don't be so hard on yourself. Write less if it makes more sense. Write more if you feel like it. Do whatever you want. That's the point of being a self-employed creator/content writer.