@Hoodie no disrespect at all to you. I know you've found what you enjoy and at the price point you're happy with. Plenty of my friends are happy with their binoculars in the use cases they have them for.
My posts prior went over the two points you brought up. Folks look at the twilight tests and optical clarity, namely at the center of the image, to say yes, they're 2-5% better. Are they then worth it to me? These are two easily tangible items of assessment for a binocular to anyone.
The worth of the big three goes way beyond this. As I suggested in my prior posts a good listen is the podcast from the JOMH with Omer. It perfectly dissects the optical instruments that binoculars have become for the modern-day hunter.
Field flatteners are an interesting point and are done in different ways across all of the top-tier binoculars. No system is the same and I suggest anyone that has the rolling ball problem with say an EL give others a shot. They will probably not have this with a Swarovski NL, Leica Noctivid, or Zeiss SF. These instruments are manufactured to deliver an image that they believe is close to a perfect way of viewing the world. Some have more 'flattening' while others have less.
I'm interested to know what $500 binocular has field flatteners and better edge-to-edge clarity. The field flattener creates an image that doesn't appear convex in its shape. It definitely helps as a part of edge clarity but doesn't truly define it. What we're talking about here is the useable FOV. The SLC's useable FOV for me is almost at 100% but with slight convex edges. My eyes can move around the image while glassing. Other binoculars I have to stay true to center leading to eye strain.
We haven't even gotten into ergonomics, eye relief, depth of field, coatings, color fidelity, sharpness, contrast, IP distance, and many others I'm missing. This all adds up to something bigger. Without constant field use of owning one, most, in my opinion, can't respect them. You can look at the specification all day with binoculars in regards to their stated eye relief or twilight factor/light transmission but until you use them, these are statements. There isn't a true standard ISO test for any of these that defines yes, this measurement is actually correct. I only find the big 3 three top-tier glass to be true in their statements.
The defining moment for me when I was using alpha glass was the first time I was legitimately behind my binoculars for over 12 hours. Eye strain is real and it takes all of those factors into play to allow you to stay behind glass for immense periods of time.