Value factor as a return booster?

Hello everyone, I'm currently reading up on factor investing and would like to get your opinion on a potential strategy expansion. The common mantra here in the forum or as with Finanzfluss/Finanztip is usually: “Keep it simple” via MSCI World + EM or directly as a one-ETF solution via the FTSE All-World. This is absolutely solid as a forecast-free basic investment, but I wonder whether performance is being left behind here. Specifically, I got the iShares Ed