…and hardly any small'ish x86_64 device allows running more than one WLAN card (due to the lack of mini-PCIe/ m.2 ports); ignoring the cost of 2-3 AP capable cards.
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Admittedly, Mediatek has made DBDC 'popular', so a single card could cover both bands. Heat dissipation and power consumption remain as a rather big problem for wifi6 cards though.
thanks for your help. I filtert @frollic posted list here for me:
Long story short, i am going to dismiss the idea of inbuilt wifi 6 and will look for a single board computer. I think the NanoPi R4S will serve my needs. Any complaints?