You have little to no experience with both NVR and PC based NVR's as evidenced by your post. Let me help correct your false and misleading statements.
Nothing you said is truthful.
If you buy the right cpu or use software that does not tax the CPU you wont have a "cpu taxing" issue. You do understand that NVR's cpu's are also taxed and that is why they are limited by to certain bitrates?
You can completely eliminate and prevent MS updates if you wish. What world do you live in?
A computer is NOT easier to hack than an NVR. Have you seen the backdoors and hacks for NVR's? Moreover the manufactues do not issue timely firmware updates. Therefore you if have half a brain, you use a vpn and dont expose the device to the internet.
You can stream using a vpn with BOTH a pc OR NVR.
I run over 20
blue iris pc's many of which are 6-8 years old. I have never had an OS hard drive fail. I maintain over 100 pc overall, never had an SSD fail on me. Stop with the nonsense. If your storage drive fails on your NVR you have the exact same problem.
a cheap computer can easily handle 16 cameras. You are clueless again. It all depends on the software, settings, what "cheap" means, cameras resolution and frame rates.
Onfiv is misleading in that many IVS features dont work across brands.
Computers dont pull 200+watts there are many threads on this topic in this forum. A modern i5 machine will draw 30-50w for your average load. Stop literally making up facts.
MS
NVR software is easily hacked.
Pc's are designed to run 24/7 without failure. Like I said, I have over 20 blue iris machines running 24/7. Some for as long as 8 years.