I didn't want to discourage anybody, but admittedly, re-reading my content could seem like that. Mine is not a "please write less" to the author.
I'm saying "don't value quantity over quality", which is one of the points that the author highlights in his opening.
My opinion is that you can practice at writing long-form, high-effort content. Maybe the outcome is not what you expect to be, that's not problem; you put the relevant time and effort at it, and you'll improve.
But I really doubt that firing a lot a lot of unresearched, unsubstantiated tweets will ever let anybody write a good article or book.
I tend to write excessively loquacious wandering diatribes with meandering sentences that bounce my readers around with so many twists that they get a concussion and I fail to communicate.
Usually, I do notice when I am at it. But only because it was pointed out so often in college, and by my friends.
Online, I only sometimes realize the replies that seem incoherent are actually coherent - and replying to what I actually said, or reasonably could be interpreted to have said, rather than what I thought I said.
Besides that experience, and the very rare "well written!" or similar, I get no feedback about my writing online.
You sound like you are someone who values high quality writing. You want to read good stuff.
If you want people to write good stuff for you to read, you should encourage them to practice!
It costs you very little to skip past content that you don't think is worthy of your time. But if you discourage people from writing that, they'll never get enough practice in to level up to the point where you DO appreciate what they have written.
One thing the internet doesn't have is a space shortage. what it DOES have is plenty of mechanisms to help you find recommendations for good stuff to read.