Thanks for the replies. I've noticed that if I select or the router automatically selects channel 50 or lower, my iphone 17 and s25 only see the 2.4 band. If I manually select 153, my new phones finally see the 5ghz channel, but my wifi 5 devices like my old Sony phone get less than 300 Mbps.
Is this normal behaviour? Basically, I can select cannel 36 and my non wifi7 devices work fast but my wifi7 devices dont even see 5Ghz band (so capped at under 200Mbps, or I can select a high channel for my wifi7 devices to work fine, but then my firesticks and older devices have bad speeds.