Advice on ASUS RT-ax89x

I would not choose that device.

Not so much because of its current support status (which will hopefully come around; still, it can't be considered to be supported right now), but because of ipq807x' reliance on NSS for offloading. This might not be a problem for ipq8072a+ and 1000BASE-T (or maaaybe 2.5GBASE-T), but getting anywhere close to 10GBASE-T would require NSS to work (which is not going to happen, ever).

...and without actual/ effective 10GBASE-T support, there'd be much cheaper options around.

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