It is optimizing for time spent, not just a click
LinkedIn's ranking weighs how long someone stays with a post (reading it, expanding a "see more," watching a video through) more heavily than whether they reacted to it. A post that gets skimmed and scrolled past sends a weaker signal than one that holds attention, even if the reaction count looks similar.
Personal profiles tend to outperform company pages
A post from an individual's profile generally reaches further than the same content posted from a company page, which is part of why so much B2B content strategy has shifted toward founders and employees posting personally rather than a brand account alone.
Obvious engagement bait is actively worked against
Tactics built to farm reactions ("comment YES if you agree," asking people to tag a friend for no reason) are exactly the pattern a ranking system optimized for genuine engagement is designed to detect and discount. A comment that starts a real exchange is worth more than ten reflexive ones.
A link to another site is a real tradeoff, not a neutral choice
Content that keeps a reader on LinkedIn (a native document, a video, a self-contained post) tends to be favored over a post whose whole point is sending someone away. That does not mean never link out. It means a link works better as a first comment or a follow-up than as the centerpiece of the post itself.