I hear you. It worked "properly" for me (XT8 set, wireless backhaul as a brief test) but what it can do with a wire is very much better. "Can't means won't" run a wire, hahaha! Just sayin'.
I have now experienced far too much daily frustration with Asus AImesh reliability. I've tried both RT-AX88U and XT8 hardware configurations. I'm ready to avoid Asus wireless gear altogether, due to firmware issues disconnecting wireless clients and maintaining the AImesh. It seems it may honestly be easier and more reliable to place an x64 Linux box in each of the node locations.