Even before the uptick in compulsive (often geo)politically divisive statements on that site I had come to the conclusion it was not a great source of accurate optics reviews. Along with some already pointed out parroted flaws and misconceptions about optics stated on that site as fact, I have found that I personally disagree with many of the binocular reviews. After finding the site and reading glowing reviews of SVBONY binoculars I bought a pair and found them thoroughly disappointing. This pattern happened a few more times comparing my impressions to his and I decided that either the reviewer had
very poor vision, or alternative motives for hawking cheap Chinese junk. I do not have any problem inherently with cheap Chinese optics to classify all of them as junk. My most used 8x42 and one of my favorite binoculars is a Bushnell Legend M, made in China and paid less than $200 for it; my first purchase here on this forum! I also have a Nikon Monarch Fieldscope ED which is also made in China and superb. I am merely pragmatic about what is possible within a given manufacturing budget. There is an engineering concept called geometric dimensioning and tolerancing that relates and communicates engineering tolerances. The tighter the GD&T, the higher the cost, often exponentially so. In some cases design specifications cannot be met with available tooling and materials (see
China's struggle to produce a ballpoint pen). Consistently producing homogeneous high-quality optical glass is hard. Machining it into precision lenses with consistent surface polish is also challenging. Producing moving parts like hinges and focusers that can precisely move over each other repeatedly with the right tension while not degrading over time is hard. It is obviously not impossible as many fine optical instruments have been made for a very long time. However doing so consistently takes time and money. China has shown they can do it with the monarch field scope and a number of camera lenses, but it seems in sport optics, Chinese manufacturing is chosen as part of the race to the bottom.
I guess the point of this stream of consciousness rambling is that a $500 binocular cannot consistently beat products costing multiple times more. They have shortcomings, weather optically, mechanically, in the materials, or all of the above. If their users are satisfied with them (as I am with my Bushnell's), then great for them! It is up to the consumer what level of quality is the best fit for them personally.