Recently, people keep asking me what "data availability / ordering / finality" actually mean... Basically, there's one main point: whether the on-chain results you see can be "front-run and then changed," and whether you can still find out what actually happened afterward.

Ordering is like lining up to buy bubble tea; who goes first and who goes last is very important.
Finality is like the bubble tea being finished and handed over, then being taken back by the shop staff to redo.
Data availability is more like a receipt; you need to be able to get it so you can reconcile later or write scripts to log, otherwise you're left with just a "trust me."
Recently, during extreme funding rate situations, people argue in the group about whether to reverse the trend or keep squeezing the bubble.
I usually focus on whether the on-chain transaction/settlement queue is being "squeezed" excessively...
Anyway, no matter how many terms there are, in the end, it all boils down to: don't let yourself be sorted inside a small black box that you can't see.