You are right, but you can write a novel worth of tutorials, not even breakthrough the startup SP, and people will gain value for years.
Knowing that the rewards of efforts for any efforts end at 7 days, it's better to write a singular article as multiple small parts spread out daily than to make a solid full length essay.
Yes, you'll make more attractive posts, over time you will build a larger following, but over those months and years, you still get to see garbage posts making hundreds or even thousands, daily.
The system is designed in such a way where there's a built in motivation to post click bait, to look into strategies like timing, what bots to use, what is the best time to click like... It makes it into a game.
Actually, even posts like this where there is a discussion following are few and far between.