Recently, people keep mentioning "data availability," sounding like exam questions, but the main point I see is this: can others see what you see, and can they reproduce it? If it can be reproduced, you feel assured; if it can't, even the fastest confirmation is like an ambiguous "I believe you" relationship, which will eventually lead to problems.

Words like ordering and finality shouldn't be feared either; basically, it's about who sets the sequence and who makes the final decision. Recently, the heated debates over privacy coins/mixing coins have been intense, and as the compliance boundaries are torn apart, people are more easily influenced by these terms... Anyway, I now prefer to take it slow and hope that on-chain matters don't rely on "trust." That's all for now.