Good luck with “exhaustive” because people have different unique reasons to come to the fediverse. It would be a very long list.

For the average user I’d approach it with points that affects everyone:

• We can’t have a Twitter-style take over
• We can’t have a Reddit API disaster
• It’s distributed so while parts of the fediverse come and go, you’ll never lose the platform as a whole.
• It’s distributed geographically so one hostile country can’t silence information from other countries like Facebook and Twitter are doing.
• No algorithms designed to keep you scrolling forever
• No ads or commercial content being pushed by the algorithm
• Loads of choices for instances and moderation style for everyone’s taste.
• Users get to choose how they want to browse and with which apps: you’re not stuck with the latest crappy redesign you hate. You’ll never be forced to have reels and stories in your feed if you don’t want that.
• Not controlled by big corporations like Meta and Google, but rather the community for the community.
• If you have sensitive communities you can own the servers to ensure it’s survival in situations where Facebook would immediately ban that page/group.
• No bullshit AI products shoved in your face like Grok or Reddit Answers.
• You as a user are in control of what you see and don’t see.
• No advertiser friendly content policies forcing you to use stupid words like “unalive”, “pewpew”, “corn” or algorithmic downprioritization because you swore.
• If you prefer to browse Instagram-like, you still get to see Twitter-like post, and you friends can see your photos from a Twitter-like interface. Or you can have a Twitter-like interface and interact with Reddit-like posts on Lemmy.

It’s harder to onboard and figure out by the common people but it would be the final platform switch. You may move instances over time but you will never be left looking for a new platform because the old one enshittified. You just move to an instance that hasn’t, done.