As mentioned, newsletter are more for discovering, not learning about something you already know.
I also browse reddit, medium, dev and a few other channels, but it's time-consuming and interesting content is scarce.
I subscribe to a couple of newsletters and the signal to noise ratio is much lower.
For someone who is actually busy, I think newsletters are a good way to stay up-to-date with minimal time investment.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.