Just woke up and saw more people talking about builder and bundle, it feels like retail investors don't really need to memorize the entire PBS/MEV setup.

You only need to know one thing: your sent transactions may not be included in the block "in the order you want"; someone might bundle a series of transactions to compete for better execution, which also eats up your slippage/front-running space.

For retail investors, I think it's sufficient to know:
1) Don't casually use ultra-wide slippage;
2) For large swaps, try to use protected routing/private channels (at least don't leave yourself hanging in the public mempool waiting for others to watch);
3) If the transaction price looks strange, first suspect your transaction path and mempool exposure, rather than jumping to conspiracy theories.

Recently, the AI Agent automatic interaction wave has become more obvious: the narrative is hyped up, but the safety details are basically not seriously examined.
Auto trading = automatically handing over permissions, signatures, retry logic, and if something goes wrong, it's just mechanical chain errors...
Anyway, I now prefer to earn a little less than to let bots "diligently" make mistakes for me.