If you ask me whether retail investors should research block builders, bundles, or not, I honestly think you shouldn't push yourself to become a researcher... Just know what a "sufficient version" is. Basically: the transactions you send may not be added to the blockchain in the order you want; some people will bundle, insert, or reorder transactions before including them in a block, so take advantage of what you can.

For retail investors, I think knowing three things is enough: 1) Don't believe in "once I click, it must be executed first"; slippage and failure rates are not mystical; 2) When encountering popular tokens or low liquidity, don't send large orders all at once—split orders, set limit prices, and avoid chasing high prices to minimize MEV exposure; 3) Don't randomly click on unknown "speed up/private bundle" buttons—most of the time, the small fee savings aren't worth the learning curve.

Recently, those new L1/L2 chains are issuing incentives to attract TVL while old users complain about "mining, selling," which is quite similar: no matter how beautiful the rules are written, it all comes down to "who is bundling, who can act first." I just see it as archeology—knowing where the pitfalls are and avoiding them, there's no need to compete with them physically.