I do not know whether the worry of Xiaomi routers phone home feature is really that serious or not. If you are worried, then do not buy this one. I believe you can simply block them by using things like Pi-hole. Using it as an AP should also help.
Xiaomi AX3600 is better since you can actually gain SSH access and even strip the extra Xiaomi phone home stuff off.
Ref:
https://github.com/geekman/xqrepack
I was mainly saying the FW features are pretty plain and needs work, not matching the top notch HW specification. So it is better to run Xiaomi routers as an AP if you are a power user and need features like those Asus routers. But for many users, the features may already be sufficient.
I will wait for the SSH access before I am going to buy Xiaomi AX9000. And with AX9000 out, I will no longer look into Xiaomi AX6000 myself.