For me it was either not wanting to deal with this too much (ensure they remain safe through time), or also being too paranoid (what if the NVR pivots or has a SIM card? / what if there's a CORS endpoint that triggers when I visit news-website.com from a device with access to the camera VLAN).
All local, wired, and outdoor quality is good. Especially at the 4K models, but even the 2K models look great.
I ended up with them for 3 reasons:
1) Asian alternatives are cheaper, but way too chatty (probably govt. subsidy) 2) It's very difficult to find any high quality NVR that works on Debian and supports enough streams / cameras 3) Their approach to security, minus one major event, is proactive and okay.