A good writer takes ownership of their communication. That means it’s their responsibility to make sure the reader understands their intent.
It’s not enough to say “you can tell it is raining by looking out the window “ when you can say “if you look out the window and see water falling from the sky, then it’s probably raining outside.”
It might seem obvious from the speaker’s perspective what cues one should look for to detect rain, but consider the possibility your reader grew up in a desert.
On the internet, your audience may come from any country in the world. It is very likely these readers have been taught a very different set of common sense that would be equally foreign to you.
This is why when communicating, the line for things that are so obvious they don’t need to be stated is so far away that you shouldn’t ever need to worry about crossing it.
And even for the readers who’ve started with the same collection of disjointed facts as you, it’s your job as a persuasive writer to help us connect the dots. This is why we tune in to read.