Lately I keep seeing the words “data availability / ordering / finality,” which sound like exam topics, but really you just need to focus on one main thread: Will my transaction be “visible but reordered” or “not even recorded on the chain at all” and cause problems? Data availability, simply put, is whether you can verify the transaction afterward; ordering is about who gets to queue and who jumps the line (that MEV nonsense); finality is about not allowing rollbacks and reverts. When playing with DeFi or NFT fragmentation that involves liquidity binding, the biggest fear is thinking you've completed a trade, only to have it change a few minutes later… it totally crushes your confidence. Plus, with recent tax hikes and tighter compliance in some places, deposit and withdrawal expectations are shifting, and everyone cares more about “certainty.” These three on-chain issues suddenly stop being esoteric. Anyway, I now ask projects first: who keeps the data, how is it ordered, and how long until it’s considered stable—don’t just look at the narrative. What about you?