Lately, terms like blockchain builders and bundles have been brought up again to scare people.

Actually, retail investors just need to know what's "enough": as long as you understand that your orders may not enter blocks in the order you want, and that someone might bundle, jump the queue, or take a detour, the result could be slippage, execution price, or even seeing a trade almost complete but being snatched away beforehand.
To put it simply, don’t treat it as mysticism; see it as "the trading environment becoming more complex."

My bottom line is: don’t chase aggressively on the chain, don’t use high slippage you’re not confident in, and don’t treat a single trade as your lifeline—set your positions and stop-losses beforehand.
AI Agents have been pretty popular lately; some boast about "automatically running strategies to free your hands," but I’m more concerned about their wallet permissions, trade signatures, and who they’re actually interacting with...
The small convenience saved might lead to an authorization mishap, which isn’t worth the risk.

What I fear most isn’t missing opportunities, but distorting the sense of boundaries so much that in the end, you can’t even clearly explain how you lost money.
Let’s leave it at that for now; I’ll review again this evening.