You can see details plenty far away with the 8x binos. I never mount my binos on a tripod, and I often take a peek holding them with one hand. A common use for me is moving through terrain and stopping to glass the surroundings for a minute before I keep walking. If I spot a deer or hog that I can't easily analyze (sex, antler size) with the binos I just switch to the scope and turn the magnification up to 20x +.
The limiting factor for me is not the ability to see small details very far away, but rather field of view and practical field of view when the binos are shaking and swinging in my grip. It's hard do discover a deer that's hiding in the section of the view that is intermittently disappearing, as the bino moves.
To me, binos are supposed to be handy and comfortable. 8x is plenty. 10x is not ideal for me, and 12x just makes me think you could have gotten a spotting scope instead.
I know a lot of people here hunt in terrain that differs from where I hunt. If I was glassing to discover elk up in the mountains, then maybe the higher mag would be better. I mainly hunt fields lying between strips of forest. Typically spot the game at 100-500 meters distance. Sometimes up to 1 km.
It's really a matter of preference and individual context, but don't cheat yourself into thinking that higher magnification makes the binos better as a tool, regardless of what you're going to be using the tool for.