If the feed is strictly chronological, then the user has a better chance of knowing when they've seen everything, and won't come back to the content until more

If the feed is strictly chronological, then the user has a better chance of knowing when they've seen everything, and won't come back to the content until more time has passed. With the algorithmic feed, you could refresh the page at any time and get a different personalized set of posts that make it feel like your feed is more active than it actually is.