Because all we talk about on BladeForums is lock strength? /sarcasm
Lock strength is the paramount concern and benchmark for folders, so obviously, that's what's marketed. Manufacturers make videos to show people what they want to see, aka marketing, then buyers mimic or elaborate those tests at home and make their own videos for posterity.
It's the same reason you see prying videos for fixed blades, it's the perceived measure of toughness.
To think the likes of ZT, Spyderco, Benchmade, Emerson, Strider, and even companies like Victorinox have never considered and test lateral stability, is folly. At the very least, it's tested to reveal design flaws that would lead to potential lawsuits, which I'm sure is a big concern to most successful knife manufacturers.
I say this with regards to hopefully seeing you succeed with this design.... You need to put down the keyboard and find someone with PR experience, because your delusions of grandeur are sucking the potential and profit out of your design here.
Totally agree with your last sentence. Its a cool design, mechanically interesting. With a closed two sided handle it will probably feel good in the hand. The now open side needs a cutout that fits the closing lever so when its a (sigh) fixed open blade

Its just the attitude of this guy... I don't know him and don't like him already. I understand creating something cool and loving it to death but not accepting criticism and dealing with it by slapping people in the face with a keyboard... Meh.