Recently, I saw a bunch of people treating "data availability, ordering, finality" as some kind of mystical concept to scare others.

Actually, just focus on one main thread: the transaction you see on the chain—who ordered it first, whether everyone can verify the data, and whether it can be reversed or reorganized in the end.
In simple terms, it's about "can I see it, who decides, and does it count."

So which one should I look at?
Start with finality—don't think that once it's implemented, it will never change...

When I draw wallet relationship diagrams, I also casually note which chain / block production rhythm is used.
Impulsiveness aside, at least I know who I’m betting against.
Recently, RWA and US Treasury yields, on-chain yield products are being compared side by side.
I just want to remind myself: the yields look attractive, but the underlying "who can modify the ledger / can it be fully verified" is quite far apart.
Anyway, I first write the risks into my notes before I get itchy to act.