Less information density = more time required to read the same amount of content = more "engagement". This is the exact same reason behind the algorithmic timeline: since you can't easily tell whether you've reached the end (up to where you left off last time), you keep scrolling more, thus more time spent and more opportunities for ads to show up.
This trend will continue until users revolt against this by refusing to use engagement-funded services in favor of service they actually pay for, so that the incentive is no longer to waste the user's time to generate engagement but to give the user what they want in the most efficient way possible in order to keep them paying for the product.
This trend will continue until users revolt against this by refusing to use engagement-funded services in favor of service they actually pay for, so that the incentive is no longer to waste the user's time to generate engagement but to give the user what they want in the most efficient way possible in order to keep them paying for the product.