How do I know if I need a Wi-Fi 7 extender instead of Wi-Fi 6?

Dual-band Wi-Fi 7 extenders like TP-Link's RE223BE add MLO and newer modulation but, as the product page and community threads note, they skip the 6 GHz band that's the real headline feature of Wi-Fi 7. Unless your router and client devices are tri-band Wi-Fi 7 with 6 GHz, the practical gain over a good Wi-Fi 6 extender is modest. Buy Wi-Fi 7 for future-proofing, not for an immediate speed jump.