I really constantly have to fight the urge to NOT say/write something because it might be obvious or someone might have said it before.

Just say it.

I recently gave a talk about lessons learned in the past, and it felt really awkward, like, "who am I to tell people what to do?". A few days later, a student walked up to me and thanked me for it, because he adopted a practice I had suggested and thought it was useful. And I had troubles sleeping before the talk because I kept thinking about how plainly obvious it was going to be.

I started blogging again when I discovered that indeed, even if it's only me who finds this useful, it makes sense to write about it. As an exercise in writing, or in case there's at least ONE person on the internet who finds it useful.