I am guilty of writing walls of text as comments, but I try to stick to my lane. You can see my most recent wall of text about freeze dryers as an example. There are a few things that I think need to come together to create a good, high-effort post:

• Passion - If you don’t care, you aren’t going to spend the time to write about something
• Knowledge - For some topics this may be less required, but I tend to create walls of text about technical issues. I have a PhD in physics, so that gives me a pretty good foundation of knowledge to work from in this regard
• Writing Ability - You need to be able to write effectively to make a wall of text worthwhile. This is a skill that gets better the more you do it.

The other thing I tend to do when writing a high-effort post is I actually proofread it before making it. I try to cut out unneeded tangents, reword things that might be confusing, or supplement things that aren’t motivated enough.

For me personally, this doesn’t take me too long to do since I have been writing and presenting about extremely technical topics for about two decades at this point. Like I mentioned above, informative writing is a skill that gets better with practice. So, doing it regularly as a significant part of my job as well as providing feedback to others on their writing/presentations, has provided me with tons of practice to improve these things.

If you want some formal guidance on scientific writing/presentations specifically, two books I have found informative (mostly on presentations) have been:

• The Craft of Scientific Presentations by Michael Alley
• slide:ology - The Art and Science of Creating Great Presentations by Nancy Duarte