No need for Ubiquti switch. Any PoE switch is fine.
At this point, the NVR cannot recognize events of any type created the cameras themselves--either AI or tradition motion detection. That said, the AI Port also does traditional motion detection for each camera as well. There is no downside here.
Segmenting cameras into a separate sandbox (read: creating a VLAN) is a router function, not an NVR function. And traffic to the internet zone for that VLAM can be disabled.
Yes, it is possible to connect to the NVR via local IP. That said, I'm not sure why you would do this. The product is made by an American company, not the PRC.
Is it perfect? No. But the trade offs are well worth it to be able to use a modern interface that is incredible intuitive.