Any software you have for encoding is already licensed
That's not guaranteed. Most open source software isn't licensed.
and any non-commercial usage doesn't require a license at all.
Not accurate. Some, but not all, non-commercial usage doesn't require a license for the media, but the software still needs a license.
MaximumPC paints this a little bit different. Where only lower end cpu's get a big boost in conjecture with higher end AMD cards.
I was wondering how that made any sense, because I've never seen my i7 more than 20% used in any game where I've monitored CPU usage. However, I haven't played the Battlefield games in years.
CPUs can bottleneck even at 20% utilisation. The task manager will show 20% average utilisation, but that could mean that it sat at 100% utilisation for 20% of the time, rather than 20% utilisation for 100% of the time (or some mix in between).
For the extreme example of the full loop you describe where the car is upside down at the top of the loop, the car needs to be going fast enough to counteract gravity at the top of the loop. The formula that describes this minimum speed is V^2 / R = g (V is minimum velocity at the top of the loop, R is radius of the loop, g is the gravitational acceleration that must be overcome). Notice that when the car is vertical gravity is pulling the car backwards, which causes it to slow down. It will speed up again by the same amount (if you ignore friction) at the other side of the loop as it's vertical facing downwards. This situation is completely different to the deformed rubber sheet analogy, I'm not even sure why you brought it up.
Test your backups after you make them
it's a cheap and easy 99% solution
It's not a solution. It's a bare minimum requirement that doesn't solve for bitrot.