[hajile]

Adding 2 frequency ranges is more expensive. If you're going to choose just one, you should choose the one with the greatest backward compatibility.

[0x457]

Realistically 2.4Ghz is far from "greatest backward compatibility" since there is a real benefit of running 5Ghz and 6Ghz only networks.

2.4Ghz makes sense because this tiny device does not need high speeds Wi-Fi connection, and deployment scenarios benefit from 2.4 GHz penetration more.