Recently, I keep seeing people talk about block builders and bundling, as if if you don't understand, you'll be "eaten."

My own feeling is that retail investors just need to know "don't be naive": the transactions you send out may not be included in blocks in the order you want, someone might bundle, cut in line, or casually snatch a little.
This isn't conspiracy theory; it's just that there are people in the process who are specifically doing this work.

So now I don't worry too much about the detailed principles, more about being conservative in action:
Don't chase those obviously crowded hot pools on the chain, don't use too aggressive slippage, split your transactions if possible, and if something feels off, withdraw.
Taking it slow might actually make you seem more like a real person.

Speaking of the recent wave of new L1/L2 incentives to attract TVL, I understand why veteran users complain about "mining, dumping, and selling."
It's lively, but liquidity is like migratory birds—coming quickly and leaving just as fast.
Someone even scolded me: "You keep watching these 'bundling and cutting in line' things, why do you become more and more Zen the more you watch..."
I don't know either; maybe I just don't want to bother with short-term fluctuations.
For now, that's how it is.