I have some experience with these knives, well a lot actually. I watched your video so here goes:
1. The Para2 does not appear to be a "bad one" out of the box, simply because it is tight. There is a growing unrealistic expectation that every knife at any given price point is somehow supposed to flick open as if it were riding on bearings. Not true, yet the expectation is there. The knife is supposed to be "tight" because I assume that it is a brand new knife correct? If so, then that is actually a good thing because people don't like buying stuff that is made sloppy right out of the box. So, really it is an nonissue. If the knife blade simply fell, then it could very well be considered a gravity knife and illegal in many places. Because by using the same principle you could open it by pressing the lock tab and simply flicking your wrist.
2. These knives are built in machine shops, there is a lot of debris floating around in the air, oil, steel shavings on surfaces, dirt, etc. That has an impact on many knives at this price point and even into the $300-$400 range. I know this because I have seen it on brand new knives I have bought that are in that upper price range. It comes with the territory so to speak, with production knives. The solution is to wash the knife out with warm soapy water, rinse, blow the remaining water out with compressed air and relube. I wouldn't and don't consider this a flaw or defect in any way.
3. Everyone has different amounts of dexterity and hand strength. It really is unfair to say that a $13 knife is "better" on that aspect alone. Now, the way that the pivot is designed, both torx screws are supposed to be tight. There is a double threaded pin/nut in the center. Loosening one side or the other can and does create blade play.
Bottom line, you have a new knife, break it in, use it, it will smooth out over time.