If it's interesting, people will read it.

People have made long form posts here that did really well. And they've done long form posts that didn't.

The sats will tell you what people want to read. I wouldn't worry about it.

If you write an article elsewhere, this is a great place to syndicate for more visibility too.

EDIT: You definitely want to learn formatting here though. The same principles of web writing apply on SN — you can organize a post visually so that people enjoy reading it. Everyone hates text walls!