In regards to practicing two point, make sure you're practicing correct position, not reinforcing the same bad habits. It's possible to balance in two point, pinching with your knee and allowing your lower leg to slip back, but that's not what you want to practive. Your lower leg needs to be underneath you, with your stirrup leather hanging straight down, perdendicular to the ground, and your entire calf down to your ankle should be in contact with the horse's side. If this makes your horse more forward, you need to get him accustomed to it. Taking your leg off when the horse reacts to it is allowing the horse to train you, at the expense of your security.
You can rationalize those fences all you want, but aluminum lawn chairs for standards are not safe, thin, lighweight rails that the horse has trouble seeing are not safe, absent ground lines aren't safe, wedging the rails rather than putting them in cups isn't safe and on and on.
"Best light" in this context means the video shows bad horsemanship bordering on abuse. The jumps are not constructed safely, and the horses keep getting punished for jumping by the riders sitting on their backs, getting left behind, not releasing or catching them in the mouth in the air.
It's a common misconception that a hackamore is somehow gentler than a bit. It's not; in some cases in can be more severe. Both work on the principle of pressure and release, they just apply the pressure in different places - nasal bones as opposed to the bars of the mouth. The gray horse travels with his head behind the vertical and his chin tucked in - classic signs of avoiding pressure from either the bit or the hackamore.